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
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