初一数学上册科学计数法和近似数79Word文件下载.docx
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107-1.86×
106
3、用四舍五入法对下列各数取近似数。
0.0000921(精确到万分位)70.3163(精确到个位)
0.904504(精确到0.001)0.00735(精确到0.01)
4、计算。
1
(-—)3(-1)2(-3)232
2
11000005008600-6110000
500-20000001800000-53800000
9×
106-9×
105-8.4×
1047.94×
107
-1.3×
1088.91×
106-7.5×
1046.94×
108
0.0000876(精确到万分位)0.204783(精确到十位)
1.86027(精确到0.001)0.00935(精确到0.001)
(-—)3(-8)3(-3)282
3
-5000001000340000-15000
1100000-2200011000-417000000
-3×
1077×
1032.7×
107-5.58×
-2.9×
105-3.37×
1042×
1022.94×
0.000943(精确到万分位)7.23603(精确到十位)
0.597042(精确到0.001)0.0832(精确到0.1)
(-—)3(-1)3(-3)222
50000005000000010000000-9050000000
-10000340000000450000-66500
-2×
1046×
107-1×
108-7.29×
103
-3.2×
106-1.27×
103-4.5×
103-5.44×
104
0.000826(精确到万分位)1709.48(精确到十分位)
0.186907(精确到0.001)0.069(精确到0.01)
(-—)2(-5)2(-3)313
5
-1200-50000033000-20800000
5002500000009100000-5130000
-4×
1052×
103-2.7×
1082.97×
-5.7×
102-8.83×
1062.7×
1066.16×
0.000655(精确到万分位)0.673772(精确到十位)
0.211688(精确到0.1)0.0534(精确到0.01)
(-—)3(-8)2(-2)273
50000080000006500000-175000
17000070000002900000-631000000
105-3×
1028.7×
1077.11×
-8×
102-7.31×
102-7×
108-1.08×
0.000574(精确到万分位)946.54(精确到十位)
22.1635(精确到0.001)0.0772(精确到0.01)
6
(-—)2(-7)3(-2)332
-5006000560000-857000000
20000-44008300-22800000
3×
104-3×
1033.8×
1031.35×
-9.9×
1044.12×
1039.1×
107-8.19×
0.000649(精确到万分位)932.312(精确到个位)
31.0423(精确到0.1)0.00936(精确到0.01)
(-—)2(-8)3(-1)212
4
-30000-30000052000000-5150000000
1800000-24000008100-1890000000
1×
1025×
103-5.7×
108-4.52×
102
4.4×
1081.95×
1063.4×
1059.08×
0.000914(精确到万分位)0.949257(精确到十位)
1.27652(精确到0.01)0.0536(精确到0.1)
(-—)2(-3)3(-4)462
-400000-7009200-94900000
-14000000-1700000062000-9530000000
1028×
108-2.8×
105-7.92×
9.8×
1038.32×
1047.9×
1036.86×
0.0000751(精确到万分位)51.9094(精确到个位)
21.6731(精确到0.01)0.00549(精确到0.01)
(-—)3(-3)2(-4)383
13000000-8000050000-228000
-1100-320000066000000-2980000000
-5×
102-3×
108-9×
103-3.54×
108-3.13×
1084.9×
10