小数四则混合运算专项练习题有答案ok.docx

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小数四则混合运算专项练习题有答案ok.docx

小数四则混合运算专项练习题有答案ok

小数混合运算专项练习276题(有答案)

 

(1)0.11X1.8+8.2X0.11

(8)1.56X1.7+0.44X1.7

 

2)2.34X99+2.34

(9)1.8X[(3.41-2.9)-0.03]

(3)5.4-2.7X0.8

10)0.125X32X2.5.

4)132X101

11)1.258X18.5-0.258X18.5

 

 

(5)6.25-1.25-0.8

(12)8.48-0.8X0.9

17.17-6.8-3.2-6.17

(23)

5.4-[2.5X(3.7-2.9)]

5.4X[(1.3+2.15)-0.2]

(24)

0.8X(4-3.68)-0.01

8.4-0.6+8.4-0.4

(25)

83.7-12.83-0.17

16.8X10.1

(26)

5.96+13X(3.2-3.12)

10.9-0.9-0.2+1.8

(27)

4.32-2.4X1.7;

1.25X3.2X0.25.

(28)

16.2X4.5+3.8X4.5;

1.36+4.85+2.64+6.15

(29)

9.05-3.86-3.14;

15)

16)

17)

18)

19)

20)

(36)0.36+9.6-3.2.

44)4.63X1.4+46.3X0.86

47)

2.9X99+2.9

(55)

(36.7-4.9)X101-31.8.

48)

25X11.2X4

(56)

6.33X101-6.33

(49)23.25—6.75-3.25.

(57)35.6-5X1.73

(50)125X3.2X2.5

(58)1.6X55.4-55.4X0.6

51)3.6X10.1

(59)17.68-5.2+2.7X1.5.

 

 

52)5.8X2.7+0.58X73

(60)1.08X0.8-0.27

(63)0.34X101-0.34.

(71)5.4-[0.51-(1.2-1.03)]

64)

0.125X32X2.5

(72)

[(8.1-5.6)X0.9-1.05]-0.04

65)

0.8X6.3-0.8X3.8

(73)

10.8-0.8-(0.35+0.05)

(66)504-3.2X2.08

(74)8X[1-(2.3-2.25)]

67)(20-0.8X9)X5.7

75)2.64X9.9+0.264

 

 

(68)2.4X1.5+3.6-1.5

76)4.52+0.61+1.39+6.48

 

69)7.38-5.14+3.62-2.86

77)4.27-(1.96-1.73)

 

80)4.98+8.02X2.5

88)(9.36X5+9.36+9.36X2)X1.25

(81)60.8-40.8-2.5

(89)7.236-0.18-14.3X0.02.

82)0.8X69.6X12.5

(90)9.6-0.4X0.25

83)4.98X99+4.9

(91)29.7-(5.85-0.65)

 

 

92)7.4X9.9

(84)6.48-3.2-2.5

 

85)1.2X7.6+7.6X6.8.

93)3.84-2.7X0.64

104)2.15+8.73+1.27+7.85

(96)2.72-[(8.2-6.5)X0.5];

 

97)9.12+9.12X9-60.2;

105)11.87-(8.2+1.87)

 

(98)28.4-0.4-0.25;

106)5.42-3.87-1.13

 

(99)27.36-27.36-7.6.

107)4.38-1.56+0.62-0.44

 

100)3.25X0.45+6.75X0.45

108)0.4X270X2.

(101)31.5-24.5-3.5

109)(40+1.25)X8

102)7.5X102

110)(12.5-0.05)X8

 

120)99X4.2+4.2

(112)9.9X6.9-6.9X3.9

 

113)5.6X99+5.6

121)0.25X1.25X3.2

 

(115)7.2-1.25-&

(123)(1.3+1.3X0.125X8)-(80-77.4)

 

(125)

117)9.87X99+9.87

6.25-〔(17.2-3.6X4.5)-0.32〕

126)28.4X99+28.4

(118)46.8-0.9-0.4

 

128)4X0.8X12.5X2.5

136)

7.575-[(5.63-1.88)X0.2].

(129)17.5-0.25X17+13.

137)

7.5-(5.5+1.24)

130)10.1X87

138)

0.26+15.68+9.74+2.32

(131)2.3+3.19-(22-19.8)

139)

13.26+9.55-3.26

132)1.25X7.2.

140)

6.1+3.9-6.1+3.9.

 

 

133)

9.1-1.2-6-6.24

(141)

134)

7.3+12.8-3.8X2.3

(142)

31.7-0.63(保留2位小数)

2.4X1.5+3.6-1.5

(143)0.32X0.25+0.08-4

(151)67—(2.98+0.67)

 

(144)

152)8X16—73.8X6

(9.6+1.48-3.7)-8

(145)

(153)(45+14)-73+710.

5.8-[4X(1.34—0.14)]

 

146)

5.4-[0.51-(1.2—1.03)].

154)13.7X0.125X8

147)21.35—3.25—16.75

155)0.8X[13—(3.12+5.28)]

148)33.02—(148.4—90.85)-2.5

156)102X0.56

150)18.1+(3—0.299-0.23)X1.

158)5.18+0.73+0.82

 

 

160)

12.5X7.1X0.8

168)

18-[0.3X(8-6.5)]

161)

6.12X99+6.12

169)

12.7+12.5+0.5

162)

8.6-0.86+8X0.35

170)

91-2.6-0.05=

163)

5.6X(18.5-8.5-0.5)

171)

6.3X3.7+6.3X6.3=

164)

0.125X4.78X80

172)

(3.7+1.7X0.4)-2.5=

2.8X3.6+1.4X2.8

173)

7.28+3.2-2.5=

 

176)

37.5-[0.3X(1.34-0.84)]

(184)

177)

(2.5+27.75-1.5)X1.6.

(185)

10-0.2-2.5

64X4.5+3.6X45

196)

5.4-[3X(3.8-2.9)].

(204)

197)

0.4X(3.2-0.8)-0.15

(205)

4.7X3.6+4.7X6.4

1.45X[(2.8+4.4)-2.4].

195)0.97X9+0.97

203)

7X12.5X0.8

15.02-6.8-(1.02+1.2)

(215)

0.25X0.8X0.125X0.4

0.6X[(5-0.68)-1.2]

(216)

2.7X1.5-2.7

2.7-4+6.3X0.25

(217)

9.08+5.45+11.92+4.55

(6.02+2.8)-0.4-2.05

(218)

1.25X30X1.2X0.8.

3.08X3.5+6.2X3.08+3.08X0.3.

(219)

0.6+0.94-0.208

2.3+3.91-(22-19.7)

(220)

4.85X1.25X8

21.6-[64.8-(48.6-2.7X2)].

(221)

(64-22.4-1.4)X1.2

207)

208)

209)

210)

211)

212)

 

(214)93.6X3.6+1.4X3.6

(222)18.3-6.25-3.75

(224)6.6十〔14.5-(1.7+1.8)〕

(232)[(7.6-5.2)-0.4+2.54]X32.

225)0.25X9.87X4

(233)17.68-5.2+2.7X1.5

 

226)36.7X2.1+10.8

234)35.6-5X1.73

 

227)8.45-0.45X0.1

235)(1.1-0.78)X(2.7-1.95)

228)0.73X102

236)1.3X0.75X4

 

229)7.8X5.6+2.3X4.4

(237)1.08-1.8X1.2

 

(240)8.5X[(2.36+2.42)-0.25]

248)

8X(20-1.25)

(241)3.9-[(1.3+0.6)X6-3.6]

249)

0.654+10.9X6.5

242)4.25X6.3+3.7X4.25

250)

22.7X1.25X0.8

243)205X0.99

251)

3.91X2.8+6.09X2.8.

244)25.6-7.49-2.51

252)

6.23+3.09=

245)[2.5-(6.8-4.9)]X0.8.

253)

132.4-59.8=

246)102X4.5

254)6.62X0.84=

 

(264)2.5X99+2.5;

(256)[20.026-(8.6+9.7)x0.92]-30.19.

 

(257)0.125X32X2.5

(265)10.36+4.8-16.5-5;

 

266)12.5X2.4.

258)0.8X6.3-0.8X3.8

 

(259)50.4-3.2X2.08

267)38.78-19.59+41.22-30.41

(260)204-(3.4X0.5)

268)2.74X4.86+4.86X6.26+4.86

261)(43.26+2.34)-7.5

269)0.08X(12.5+2.5)X0.1

262)(20-0.8X9)X5.7.

270)25.92+(10.1-14.5X0.2)

 

273)1.56X1.7+0.44X1.7

参考答案:

(1)0.11X1.8+8.2X0.11,

=0.11X(1.8+8.2),

=0.11X10,

=1.1;

(2)2.34X99+2.34,=2.34X(99+1),=2.34X100,=234;

(3)5.4-2.7X0.8,

=2X0.8,

=1.6;

(4)132X101,

=132X(100+1),=132X100+132,

=13332;

(5)6.25-1.25-0.8,

=6.25-(1.25X0.8),

=6.25-1,

=6.25;

(6)2.5X16,

=(2.5X4)X4,

=40

(7)6.33X101-6.33,

=6.33X(101-1),

=6.33X100,

=633;

(8)1.56X1.7+0.44X1.7,

=1.7X(1.56+0.44),

=1.7X2,

=3.4;

275)0.25X2010+20.10X75

(272)(8.16+2.09)-[(10.3-9.3)-0.4].

(276)30.8-[(6.34-4.59)X4].

(9)1.8X[(3.41-2.9)-0.03],

=1.8X[0.51-0.03],

=1.8X17,

=30.6;

(10)0.125X32X2.5,

=(0.125X8)X(4X2.5),

=1X10,

=10

(11)1.258X18.5-0.258X18.5,

=18.5X(1.258-0.258),=18.5X1,

=18.5;

(12)8.48-0.8X0.9,

=10.6X0.9,

=9.54;

(13)1.25X2.4,

=1.25X8X0.3,

=10X0.3,

=3;

(14)5.85-(1.3+0.5)X6,

=5.85-1.8X6,

=3.25X6,

=19.5

(15)17.17-6.8-3.2-6.17

=(17.17-6.17)-(6.8+3.2),=11-10,

=1;

(16)5.4X[(1.3+2.15)-0.2]

=5.4X[3.45-0.2],

=5.4X17.25,

=93.15;

(17)8.4-0.6+8.4-0.4

=14+21

=35;

(18)16.8X10.1

=16.8X10+16.8X0.1,

=168+1.68,

=169.68;

(19)10.9-0.9-0.2+1.8

=10.9-4.5+1.8,

=8.2;

(20)1.25X3.2X0.25

=(1.25X0.8)X(4X0.25),

=1X1,

=1

(21)1.36+4.85+2.64+6.15,

=(1.36+2.64)+(4.85+6.15),=4+11,

=15;

(22)98.5-2.5-4,

=98.5-(2.5X4),

=98.5-10,

=9.85;

(23)5.4-[2.5X(3.7-2.9)],

=5.4-[2.5X0.8],

=5.4-2,

=2.7;

(24)0.8X(4-3.68)-0.01,

=0.8X0.32-0.01,

=0.256-0.01,

=25.6;

(25)83.7-12.83-0.17,

=83.7-(12.83+0.17),

=83.7-13,

=70.7;

(26)5.96+13X(3.2-3.12),

=5.96+13X0.08,

=5.96+1.04,

=7.

(27)4.32-2.4X1.7,

=1.8X1.7,

=3.06;

(28)16.2X4.5+3.8X4.5,

=(16.2+3.8)X4.5,

=20X4.5,

=90;

(29)9.05-3.86-3.14,

=9.05-(3.86+3.14),

=9.05-7,

=2.05;

(30)7.28+0.72-0.9,

=7.28+0.8,

=8.08

(31)4.32+5.43+6.68

=4.32+6.68+5.43

=11+5.43

=16.43;

(32)17.17-6.8-3.2

=17.17-(6.8+3.2)

=17.17-10

=7.17;

(33)5.29X9+5.29

=5.29X(9+1)

=5.29X10

=52.9;

(34)16.8X10.1

=16.8X10+16.8X0.1

=168+1.68

=169.68;

(35)2.74X9.5+5X0.274

=2.74X9.5+0.5X2.74

=2.74X(9.5+0.5)

=2.74X10

=27.4;

(36)0.36+9.6-3.2,

=0.36+3

=3.36

(37)3.75X25+6.25X25

=25X(3.75+6.25)

=25X10

=250;

(38)25.46-8.23-1.76

=25.46-(8.23+1.76)

=25.46-9.99

=15.45;

(39)2.9+7.1X10

=2.9+71

=73.9;

(40)1.25X32X0.25

=(1.25X8)X(4X0.25)=10X1

=1.

(41)15.68-(7.78-4.32)-2.32

=15.68-7.78+4.32-2.32

=(15.68+4.32)-(7.78+2.32)=20-10

=10;

(42)0.25X3.2X1.25

(53)3.6+6.4X1.8,

=3.6+11.52,

=15.12;

(54)(1.48+3.02)-(3.6X0.5),

=4.5-1.8,

=2.5;

(55)(36.7-4.9)X101-31.8,

=31.8X101-31.8,

=31.8X(101-1),

=31.8X100,

=3180

(56)6.33X101-6.33

=6.33X(101-1),

=6.33X100,

=633;

(57)35.6-5X1.73,

=35.6-8.65,

=26.95;

(58)1.6X55.4-55.4X0.6,

=55.4X(1.6-0.6),

=55.4X1,

=55.4;

(59)17.68-5.2+2.7X1.5,

=3.4+4.05,

=7.45

(60)1.08X0.8-0.27

=1.08-0.27X0.8,

=4X0.8,

=3.2;

(61)102X0.45

=(100+2)X0.45,

=100X0.45+2X0.45,

=45+0.9,

=45.9;

(62)22.78-1.25-0.8

=22.78-(1.25X0.8),

=22.78-1,

=22.78;

(63)0.34X101-0.34

=(101-1)X0.34,

=100X0.34,

=34

(64)0.125X32X2.5,

=(0.125X8)X(4X2.5),

=1X10,

=10;

(65)0.8X6.3-0.8X3.8,

=0.8X(6.3-3.8),

=0.8X2.5,

=0.25X4X0.8X1.25,

=(0.25X4)X(0.8X1.25),

=1X1,

=1;

(43)9.99X1.01,

=(10-0.01)X1.01,

=10.1-0.0101,

=10.0899;

(44)4.63X1.4+46.3X0.86,

=46.3X0.14+46.3X0.86,

=46.3X(0.14+0.86),=46.3X1,

=46.3;

(45)17.5-0.8-12.5,

=17.5-(0.8X12.5),

=17.5-1,

=17.5;

(46)0.9+9.9+99.9+999.9,

=1-0.1+10-0.1+100-0.1+1000-0.1,=(1+10+100+1000)-(0.1+0.1+0.1+0.1),=1111-0.4,

=1110.6

(47)2.9X99+2.9

=(99+1)X2.9,

=100X2.9,

=290;

(48)25X11.2X4

=25X4X11.2,

=100X11.2,

=1120;

(49)23.25-6.75-3.25

=23.25-(6.75+3.25),

=23.25-10,

=13.25

(50)125X3.2X2.5,

=125X8X0.4X2.5,

=(125X8)X(0.4X2.5),=1000X1,

=1000;

(51)3.6X10.1,

=3.6X(10+0.1),

=3.6X10+3.6X0.1,

=36+0.36,

=36.36;

(52)5.8X2.7+0.58X73,

=5.8X2.7+5.8X7.3,

=5.8X(2.7+7.3),

=5.8X10,

=58;

=2;

(66)504十3.2X2.08,

=157.5X2.08,

=327.6;

(67)(20-0.8X9)X5.7,

=(20-7.2)X5.7,

=12.8X5.7,

=72.96

(68)2.4X1.5+3.6-1.5,

=3.6+2.4,

=6;

(69)7.38-5.14+3.62-2.86,

=(7.38+3.62)-(5.14+2.86),

=11-8,

=3;

(70)0.12X1.8+8.2X0.12,

=0.12X(1.8+8.2),

=0.12X10,

=1.2;

(71)5.4-[0.51-(1.2-1.03)],

=5.4-[0.51-0.17],

=5.4-3,

=1.8;

(72)[(8.1-5.6)X0.9-1.05]-0.04,

=[2.5X0.9-1.05]-0.04,

=[2.25-1.05]-0.0

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