人教版七年级数学上册第一单元有理数复习题精选70文档格式.docx
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5-(-4)2×
5
6÷
(-—)×
(-2)×
(-1)(3+6)-23×
(5+5)
3
(-3)×
2÷
(-—)-(-1)(2-9)-33-(7+3)
5、用科学记数法表示下列各数。
-17000000-300000008700000-75100000
200000-9000054000000-5910000
6、下列用科学记数法写出的数,原来分别是什么数?
5×
105-9×
104-1.4×
103-5.59×
107
7.1×
1075.26×
104-2.9×
1038.77×
102
7、用四舍五入法对下列各数取近似数。
0.000091(精确到万分位)3900.35(精确到十分位)
0.947116(精确到0.001)0.0795(精确到0.01)
8、计算。
-1+|5||4-(-5)||-6|+(-6)
-—6.5,-4.5,0,1.75,-0.75,-0.4,-0.2.
2、已知x是正数,并且-6<
3,在数轴上表示x所能取得的所有数值。
-—10,8,0,2.75,0.25,5.6,2.4.
-450+50-28+(-82)-55+90
12+(-12)10÷
(-12)3-(-10)
21-3-(-26)10-(-22)
6×
(-—)(-60)×
(-4)+(-6)×
1
8×
8÷
(-8)+(-10)(-4)3×
5-(-1)3÷
3
(-2)÷
(-8)(9+2)×
43+(2-6)
9
(-9)÷
1×
(-6)(3+2)÷
32÷
(9-8)
140009000006900-33300
-200-4000061000-2260000
-6×
1077×
104-2.2×
102-8.94×
105
-2.7×
106-3.13×
1069.5×
103-5.23×
0.0000856(精确到万分位)9827.3(精确到十位)
4.75821(精确到0.01)0.00529(精确到0.001)
9+|1||-5+(-1)||-1|+(-2)
-—4,-5.5,0,1.5,-2.75,-1.2,-0.1.
2、已知x是正数,并且-3<
—4,8,0,-0.75,1,-2.6,-1.4.
-900+5099-(-67)-70+85
-33+(-46)3×
(-3)-3×
(-11)
-—÷
5-9+(-15)1÷
(-18)
5÷
(-—)(-120)×
(-160)÷
(-0.55)×
30
180×
4×
(-10)+(-40)(-2)2×
6+(-1)2÷
2
8×
(-—)÷
(-8)-(-3)(6+1)÷
32+(6+9)
(-8)-7÷
(-1)(1-2)-23-(7+4)
20000003000000180000-214000000
17000010001200000-6300000
-2×
102-1×
1056×
107-8.57×
108
1027.86×
1063.7×
102-6.89×
0.000719(精确到万分位)46.4212(精确到十位)
15.4004(精确到0.1)0.0964(精确到0.1)
9-|-1||5-(-1)||-2|+(-8)
—6,-5,0,1,-0.75,-0.6,-1.8.
2、已知x是正数,并且-4<
5,在数轴上表示x所能取得的所有数值。
-—-6,-5,0,1.75,3,2.6,-2.5.
-200-70089-(-19)-95-10
47-(-22)10×
(-15)3-(-24)
—-185×
(-6)-10÷
(-—)(-100)×
(-6)×
250
-60×
7×
(-180)×
(-9)(-4)2×
2-(-4)3×
7
(-5)-(8-6)÷
42+(2-1)
(-2)-1×
(-—)+(-2)(4+5)+33×
(0-9)
-7005000003800-3500000000
-7000000-41000000200000-700
-1×
105-3×
1068.5×
108-7.42×
104
4.9×
1088.54×
105-1.4×
1031.74×
0.0000827(精确到万分位)0.608865(精确到个位)
0.267987(精确到0.1)0.0881(精确到0.01)
2-|-3||8+(-1)||-4|-(-5)
-—3.5,-6.5,0,2.75,-1.25,-0.8,-1.4.
2、已知x是正数,并且-7<
2,在数轴上表示x所能取得的所有数值。
—4.5,9.5,0,-1.5,3.25,1.6,3.1.
-350+550-2-(-12)-50-55
46+(-9)-6÷
(-16)-7×
(-5)
-—×
451+(-19)-6÷
(-10)
3÷
(-—)(-18)×
(-2)+(-1)×
100
-100×
6+(-6)×
(-2)(-1)3÷
3+(-2)2÷
4
(-3)+(-2)-(4-9)÷
22÷
(9-1)
(-3)-2÷
(-—)-(-9)(4-1)+23×
(2-8)
2
-18000000-8000078000000-86900
-120025003900000-744000
-4×
1049×
1033.5×
1027.1×
-1.9×
102-1.11×
1071.7×
107-5.4×
103
0.0000721(精确到万分位)7297.24(精确到十位)
0.106264(精确到0.001)0.0551(精确到0.1)
-2+|-1||-8-(-9)||-3|+(-6)
-—5,-5,0,0.25,-0.5,-3.2,-0.7.
2、已知x是正数,并且-5<
1,在数轴上表示x所能取得的所有数值。
-—-4.5,9,0,-1,2.25,-5.2,-3.5.
-400-45079-(-58)-15+10
17-(-46)-5×
(-23)9+(-11)
-—-48-6-(-26)6÷
(-17)
(-—)(-10)×
(-140)×
(-5)×
450
100×
0.4÷
(-18)-(-5)(-4)2×
6+(-4)2÷
(-9)-(-7)(3-3)×
22×
(0+2)
(-4)-8×
(-—)-(-6)(2+5)-23+(8-7)
-30005000012000000-57300
-200-1000000020000-28500000
7×
107-6×
1065.5×
102-6.25×
4×
106-7.01×
1025.2×
1031.59×
0.0000648(精确到万分位)419.627(精确到十分位)
51.7345(精确到0.001)0.0871(精确到0.001)
-3+|5||2-(-1)||-2|+(-5)
—5,-6,0,1,-1.75,-2.4,-2.7.
6,在数轴上表示x所能取得的所有数值。
—-4,5,0,-0.75,-0.5,4.4,1.4.
-250-350-88-(-17)-70+50
-1+(-4)-5÷
(-29)6÷
—-65-(-4)9-(-9)
(-—)(-14)×
(-1.4)÷
(-0.2)×
300
8+(-4)÷
(-100)(-1)2×
3-(-2)3×
9×
(-—)-(-6)×
(-6)-(0-4)×
43×
(7+2)
(-8)-5÷
(-9)-(1-1)-13×
(2-7)
1400-90005400000-954000
20000-260003900000-9420000
-9×
1061×
1062.1×
104-7.49×
7.7×
108-9×
1071.1×
1046.27×
0.0000958(精确到万分位)0.253185(精确到十位)
0.686048(精确到0.001)0.0894(精确到0.01)
8+|-3||-5+(-4)||-5|+(-7)
-—4,-4.5,0,2.5,-2,-2,-3.
2、已知x是正数,并且-2<
7,在数轴上表示x所能取得的所有数值。
-—3.5,6,0,-1.25,-1,-4.2,-2.1.
-850-25025+(-51)-70-5
-2+(-3)7÷
(-2)-2-(-12)
—×
45-3÷
(-11)-7+(-1)
9÷
(-—)(-140)×
(-1.8)×
(-80)×
0.5
12×
0.6×
(-10)×
(-8.5)(-2)3÷
6+(-1)3÷
(-—)-(-5)-(-5)-(4+8)÷
13-(7-6)
(-1)×
(-—)+(-3)-(2-6)÷
32+(2+8)
20000-5000055000000-386000
-1400320000017000000-6010000000
6×
1078×
1043×
104-6.39×
5.9×
105-4.36×
105-1.7×
1085.66×
0.00006(精确到万分位)4.79704(精确到十分位)
24.5093(精确到0.001)0.088(精确到0.1)
7+|-4||-6-(-9)||-8|-(-6)
—4.5,-6.5,0,