七年级数学上册有理数的计算题精选137Word文件下载.docx
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(-29)
8
6×
(-—)(-2)×
(-1.2)-(-8.5)×
250
6
40×
90÷
(-1.4)+(-6.5)(-4)3÷
2-(-3)2×
4
2×
(-—)×
(-7)+(-5)(1-2)+23+(1-2)
5
(-3)-1×
(-—)÷
(-2)(8-1)-42+(5-7)
5、用科学记数法表示下列各数。
7000030000002900000-939000000
1100034000000290000-12300000
6、下列用科学记数法写出的数,原来分别是什么数?
4×
1074×
1031.3×
1038.66×
102
-4.7×
1057.66×
1026.6×
105-6.33×
104
7、用四舍五入法对下列各数取近似数。
0.000911(精确到万分位)36808.7(精确到10分位)
12.0134(精确到0.001)0.00958(精确到0.001)
8、计算。
9-|-8||-1-(-2)||-1|-(-8)
-—6,-5,0,2.75,-3.25,-2.2,-0.6.
2、已知x是正数,并且-5<
5,在数轴上表示x所能取得的所有数值。
-—-4.5,-5.5,0,-2.25,-1.75,5.8,0.6.
-800-500-78-(-14)-40+95
49+(-6)-3÷
(-10)5+(-17)
-—+36-10÷
(-1)-9-(-22)
9
8×
(-—)(-6)×
(-8)×
(-15)×
3
0.6×
40÷
(-18)×
(-65)(-1)2÷
2-(-4)2×
5
8÷
(-—)-(-6)×
(-1)(1+1)+12×
(5+8)
(-3)÷
(-—)+(-2)(2-1)×
22÷
(9+5)
-1300000-30080000000-1790000
30000220003800-21600000
7×
1049×
108-9.1×
104-4.95×
-6×
104-4.64×
107-2.6×
1088.9×
106
0.000533(精确到万分位)372.631(精确到10位)
72.386(精确到0.001)0.00808(精确到0.1)
6-|3||9-(-3)||-7|-(-7)
-—6.5,-5,0,1.75,-2.5,-3,-2.4.
2、已知x是正数,并且-4<
6,在数轴上表示x所能取得的所有数值。
-—5.5,9,0,1.75,2,4,-2.2.
-500+10057-(-79)-25-15
30+(-49)-8×
(-21)8×
(-3)
—÷
309-(-8)-1-(-18)
5÷
(-—)(-12)×
(-120)÷
25
1.2×
0.3-(-12)÷
(-30)(-2)3÷
4+(-3)2÷
3÷
(-—)+(-9)÷
(-2)-(1+2)+42×
(7-2)
(-5)×
9×
(-4)(0+2)-23-(4+6)
7000030000000800000-7550000000
1400-370000006700-6710000000
-1×
1064×
108-2.8×
1073.24×
108
-6.2×
1086.96×
107-5.1×
103-9.39×
0.0000882(精确到万分位)8.88878(精确到个位)
9.1258(精确到0.1)0.00899(精确到0.1)
4-|-6||9-(-5)||-3|-(-5)
-—3.5,-5,0,0.5,-1.25,-0.4,-1.5.
4,在数轴上表示x所能取得的所有数值。
-—-4.5,-4.5,0,2.5,-2.75,-3.8,2.8.
-700-900-44-(-25)-35-75
28-(-36)-6×
(-16)-1×
(-28)
-—×
10-2×
(-11)10+(-10)
(-—)(-40)×
(-160)÷
(-100)×
1
2×
5+(-0.6)-(-0.85)(-2)2×
4+(-3)2×
2
(-—)+(-3)÷
(-1)-(7+3)-32×
(2-9)
(-3)+4×
(-5)-(0+1)×
33÷
(0-8)
2000009007100-353000
16000001100000910000-3090000000
1×
1024×
1041.7×
1088.8×
105
-1.3×
108-4.75×
1067.1×
105-9.22×
0.000666(精确到万分位)0.486253(精确到10位)
64.8863(精确到0.01)0.0726(精确到0.1)
9+|2||-8-(-3)||-1|-(-4)
—6,-4.5,0,0.25,-2,-0.2,-1.7.
2、已知x是正数,并且-2<
-—-5,9,0,-2.5,-2,-0.6,3.7.
-250-30029+(-43)-75+50
21-(-47)5÷
(-9)2÷
(-12)
—+18-9-(-20)3÷
(-11)
(-40)÷
(-30)×
45
-4×
2÷
(-85)(-2)3÷
3-(-2)3×
6
6÷
(-—)-(-2)×
(-8)-(2-4)+32+(6-3)
(-1)÷
(-—)+(-4)(8+5)+42÷
(2+1)
16000400560000-2180000
1000000-260000014000-4620000000
105-4×
103-4.6×
1083.7×
9.9×
105-7.01×
105-8.5×
1063.2×
103
0.0000535(精确到万分位)953.436(精确到10位)
86.2321(精确到0.001)0.0877(精确到0.01)
7-|-2||-1-(-7)||-4|-(-9)