初一数学上册科学计数法和近似数185Word文档下载推荐.docx
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1038.38×
106
3、用四舍五入法对下列各数取近似数。
0.0000753(精确到万分位)84.4002(精确到个位)
67.8506(精确到0.01)0.0796(精确到0.001)
4、计算。
2
(-—)2(-9)3(-3)3103
3
120000-90000000220000-190000000
-90000-50010000-41500
-2×
1074×
1073.1×
103-6.67×
103
-7.1×
1089.72×
106-6.9×
105-7.13×
0.000819(精确到万分位)1249.95(精确到个位)
1.11802(精确到0.1)0.00529(精确到0.1)
(-—)2(-6)3(-1)272
800900000600-3420000000
-11000220000001000-130000
7×
103-8×
1036.9×
1058.43×
104
-7×
105-6.32×
1054×
105-5.43×
0.00061(精确到万分位)85910(精确到十位)
0.532313(精确到0.1)0.0775(精确到0.001)
1
(-—)2(-3)3(-4)382
4
700009000037000000-5460000
-11000000-150000000600000-83200000
-3×
108-9×
106-4.6×
1062.88×
102
-4.6×
106-3.6×
105-3.56×
0.0000688(精确到万分位)88.2399(精确到十分位)
0.598111(精确到0.1)0.00783(精确到0.01)
(-—)3(-6)3(-4)422
-1300000500000004000000-7840000
1600000470005400-3540000
5×
104-1×
1043.8×
107-9.77×
-1.6×
105-9.15×
106-8.2×
1083.37×
0.0000798(精确到万分位)4.93007(精确到十分位)
7.81608(精确到0.01)0.0843(精确到0.001)
(-—)2(-6)2(-4)232
-30000001000003100-6860000000
-18000003700000120000-385000000
2×
1063×
102-3.7×
1048.61×
-9.6×
104-9.88×
102-1.6×
1022.99×
0.0000982(精确到万分位)28975.5(精确到十分位)
1.37823(精确到0.01)0.0579(精确到0.01)
(-—)2(-8)3(-1)323
5
-400000-40000000750000-260000000
100000022000000830000-2470000
3×
1037×
104-5.2×
108-2.87×
6.6×
102-8.18×
1073.5×
1028.33×
0.0000629(精确到万分位)9402.77(精确到个位)
81.1144(精确到0.01)0.0937(精确到0.1)
(-—)3(-6)2(-4)473
-19000500000400000-38900000
80000003200000005200-7030000000
105-3×
104-8.1×
1043.96×
-2.8×
106-8.5×
103-3.5×
1069.88×
107
0.00006(精确到万分位)367.356(精确到十位)
96.59(精确到0.01)0.00881(精确到0.001)
(-—)3(-2)2(-1)233
120090005600000-822000000
8000000-310000037000000-90400000
102-8×
107-8.7×
1066.16×
1.7×
107-1.18×
106-5×
104-9.91×
0.0000812(精确到万分位)4329.53(精确到十位)
1.75087(精确到0.001)0.08(精确到0.1)
(-—)2(-5)2(-4)463
4000007000005900-437000000
-20009000002100-84500000
105-5×
1082.4×
1056.31×
-7.2×
1075.59×
104-