七年级数学上册有理数的计算题精选274Word下载.docx
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2
2×
(-—)(-14)×
(-200)×
(-0.5)×
2
5
2×
0.5×
(-0.3)(-1)3÷
4+(-3)3×
7
6÷
(-—)+(-7)+(-7)(0-5)÷
32-(0+8)
(-5)+5÷
(-—)+(-5)-(8+0)+33-(4+7)
5、用科学记数法表示下列各数。
12000000900003100-604000000
-80000-120000000480000-807000000
6、下列用科学记数法写出的数,原来分别是什么数?
-8×
1024×
1081.3×
1063.87×
107
-9.4×
107-2.45×
102-2.3×
1043.67×
108
7、用四舍五入法对下列各数取近似数。
0.000729(精确到万分位)8949.15(精确到10分位)
7.46475(精确到0.1)0.0908(精确到0.001)
8、计算。
-9+|6||-7+(-8)||-5|-(-1)
-—5,-4.5,0,2.5,-2.75,-0.4,-1.1.
9
2、已知x是正数,并且-1<
4,在数轴上表示x所能取得的所有数值。
—5.5,3.5,0,-2.25,3.25,-2.8,0.1.
-100+50067-(-95)-20+60
21+(-18)-3÷
(-25)-2×
(-28)
—+3610×
(-19)8×
(-20)
(-—)(-2)×
(-1.8)+(-0.35)×
300
140×
5-(-1.6)-(-95)(-2)2÷
2-(-1)2÷
8×
(-—)-(-5)×
(-4)-(6-6)-23+(7+0)
(-6)×
(-—)-(-6)-(6-0)÷
33÷
(6-3)
4
-1600002000076000-22600
-1700009007800-88800
6×
1059×
1034.2×
102-2.25×
105
-8.8×
1047.06×
102-8.2×
1087.94×
0.000726(精确到万分位)8849.07(精确到个位)
0.419127(精确到0.001)0.0506(精确到0.01)
3-|-4||6-(-1)||-9|-(-3)
—6,-5.5,0,1.25,-0.25,-3.4,-2.9.
2,在数轴上表示x所能取得的所有数值。
-—7.5,4.5,0,3,-0.25,6.6,3.7.
-500+350-66+(-37)-35+40
28+(-38)2÷
(-20)-4-(-30)
-—+16-7+(-13)8÷
(-2)
5÷
(-—)(-20)×
(-1.6)÷
(-30)×
10
40×
0.7÷
(-1.6)-(-10)(-3)2×
4+(-2)3×
4÷
(-—)÷
(-9)+(-6)(1+4)×
12+(1-0)
3
(-4)+9÷
(-—)×
(-8)-(5+6)×
33+(1-0)
-190000500210000-72000
9000-700000008000-723000000
103-8×
1027.8×
106-5.26×
1.3×
1042.98×
1043.8×
1045.19×
0.000675(精确到万分位)28179(精确到个位)
1.43784(精确到0.001)0.0083(精确到0.001)
-3+|4||-1-(-5)||-6|-(-1)
—6.5,-5,0,1.5,-2.25,-2.8,-0.5.
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。
—3.5,-5,0,0.25,2,4.8,3.8.
-750+45053-(-93)-5-10
-27-(-35)-4×
(-27)2×
(-3)
—-637+(-22)-8×
(-14)
(-—)(-4)×
(-20)-(-35)×
1.5
-20×
50÷
(-140)+(-5)(-2)2÷
6-(-2)2÷
8
1÷
(-7)+(-1)(6-4)×
33×
(1-3)
(-7)-6÷
(-—)-(-6)-(1-6)÷
13-(9-3)
800000-3000000640000-38000
-1700002300000008000000-30000
-3×
1034×
1044.1×
1032.08×
103
-4.5×
104-5.93×
1089.1×
106-8.95×
106
0.0000663(精确到万分位)346.14(精确到10位)
9.04354(精确到0.1)0.00601(精确到0.01)
1+|2||-1-(-3)||-4|+(-1)
—6,-6,0,1.5,-1.5,-1.8,-1.8.
2、已知x是正数,并且-3<
-—4,7.5,0,-2.25,-2.25,-5.6,-3.2.
-650-20086-(-10)-95-5
19+(-37)5×
(-30)
—×
362×
(-23)-2×
(-18)
2÷
(-—)(-0.8)×
(-100)-(-70)×
5
-2×
(-140)+(-0.5)(-1)2×
3+(-3)2÷
6
4×
(-6)-(-7)(6+0)-42+(8-7)
(-9)-6÷
(-—)+(-5)-(8-0)-42+(5-0)
6000009000000320000-2320000000
30000-430006900-77100
105-1×
1036.7×
1084.15×
9.3×
103-2.81×
1027×
1063.64×
0.0000779(精确到万分位)4454.64(精确到10位)
79.9526(精确到0.001)0.0672(精确到0.001)
8+|4||-7-(-6)||-8|-(-4)