人教版七年级数学上册科学记数法和近似数综合练习题精选37Word下载.docx
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1059.37×
108
3、用四舍五入法对下列各数取近似数。
0.000842(精确到万分位)498.623(精确到十分位)
1.9621(精确到0.001)0.00591(精确到0.001)
4、计算。
4
(-—)2(-3)3(-2)213
5
-130060000000250000-32100000
-200000-10006200-2790000
-9×
1078×
1082.5×
104-9.55×
107
-6.3×
1029.19×
1058.2×
102-8.61×
102
0.0000752(精确到万分位)40166.9(精确到十分位)
4.92314(精确到0.1)0.0578(精确到0.1)
1
(-—)3(-5)3(-1)463
3
100000-4003800000-57000000
90050007300-366000000
-2×
1045×
1068.3×
102-7.48×
103
7.7×
106-8.16×
106-3.6×
1081.73×
0.000545(精确到万分位)75289.9(精确到十位)
19.9118(精确到0.01)0.0824(精确到0.01)
(-—)2(-3)2(-1)452
-1800009000160000-9970000
120048007800000-3340000
1071×
1073.3×
1021.36×
3.4×
107-1.13×
1021.2×
102-1.45×
104
0.0000976(精确到万分位)61619.9(精确到个位)
86.4393(精确到0.001)0.00912(精确到0.01)
(-—)3(-3)2(-4)432
6000001000000047000000-603000
-80000-490006000000-489000000
1×
102-1×
1077.3×
103-5.71×
-3.9×
1026.33×
1052.1×
1078.06×
0.0000736(精确到万分位)0.566675(精确到十位)
6.40307(精确到0.01)0.00808(精确到0.01)
(-—)2(-9)3(-2)332
14000000-30000039000-805000
-4005000000068000000-753000000
1062×
1074.4×
1031.4×
8.2×
104-6.98×
108-1.6×
103-2.65×
0.000967(精确到万分位)0.808933(精确到个位)
54.5496(精确到0.1)0.0906(精确到0.01)
(-—)3(-3)3(-3)482
-10000003000000087000-9310000
-800003800007500-7360000
2×
104-4×
1028×
1038.45×
-9.5×
1076.25×
105-6.8×
106-6.31×
106
0.0000767(精确到万分位)7.61649(精确到个位)
4.78454(精确到0.1)0.00989(精确到0.01)
(-—)3(-6)2(-2)243
2
-3000080007400-64700
-800370076000000-22600
-5×
108-6×
105-4.5×
1062.96×
4.9×
1045.17×
104-3.2×
104-6.86×
0.0000857(精确到万分位)0.741511(精确到十分位)
2.32785(精确到0.001)0.0931(精确到0.01)
(-—)2(-6)2(-3)413
1900000-20000000120000-150000
-40003800002500000-46500
1045.1×
103-7.31×
-9.7×
1084.04×
105-1.9×
1034.74×
0.000512(精确到万分位)7417.45(精确到个位)
34.8994(精确到0.1)0.077(精确到0.01)
(-—)3(-10)2(-2)233
18000060000001000000-756000000
1500000390078000000-776000000
3×
104-3×
1042.4×
1039.58×
6.1×
1021.19×
103-5.1×
106