初一数学上册科学计数法和近似数166文档格式.docx
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108-2.35×
108
3、用四舍五入法对下列各数取近似数。
0.0000544(精确到万分位)2.93341(精确到十位)
5.30462(精确到0.01)0.0931(精确到0.01)
4、计算。
4
(-—)2(-1)2(-1)493
3
300700000062000000-40200
200000-2500059000000-28200
7×
1043×
104-5×
1027.3×
5.9×
103-9.51×
107-8.3×
1061.49×
104
0.0000832(精确到万分位)287(精确到个位)
17.085(精确到0.01)0.00669(精确到0.001)
(-—)2(-2)3(-3)463
70000-5000000060000000-443000
-1000000-3400005000-4310000000
8×
1089×
104-4.5×
1055.39×
2.5×
103-6.94×
1054.6×
1067.04×
106
0.000557(精确到万分位)89685.2(精确到十位)
1.60498(精确到0.01)0.0673(精确到0.001)
1
(-—)2(-10)2(-1)242
2
800-90000009000000-13300000
800006000049000000-4100
103-2×
105-1.6×
106-2.68×
8.6×
103-8.05×
104-2.5×
103-6.52×
107
0.00072(精确到万分位)1.33179(精确到十分位)
19.2127(精确到0.001)0.0756(精确到0.01)
(-—)2(-9)3(-4)253
5
-400-20000020000-316000
-5000000210000770000-665000
4×
103-3×
1036.6×
1076.1×
105
-1.9×
1029.89×
103-2.1×
106-2.69×
0.00087(精确到万分位)9892.33(精确到个位)
0.148394(精确到0.01)0.0784(精确到0.1)
(-—)2(-3)2(-4)393
-1800002000410000-8200000
-60000028000470000-272000
106-4×
1056.5×
105-7.4×
4.4×
1038.08×
107-9.1×
106-3.26×
0.000836(精确到万分位)0.779711(精确到十分位)
98.6643(精确到0.1)0.0836(精确到0.01)
(-—)3(-1)3(-3)422
3000-1000006400000-519000
17000-100000005200000-56100
-7×
1042×
103-9.4×
1073.43×
-5×
108-5.83×
1055.6×
1046.63×
0.000532(精确到万分位)162.88(精确到十分位)
97.7788(精确到0.1)0.00683(精确到0.01)
(-—)2(-9)2(-1)413
110000-4009200-6910000000
-15000040000008700000-897000000
-1×
103-4×
107-7.2×
1079.59×
-3.3×
1033.27×
1026.86×
0.000616(精确到万分位)94626.3(精确到个位)
0.917809(精确到0.001)0.00699(精确到0.01)
(-—)2(-9)2(-2)353
800000-50000000310000-2120000000
-200025000000066000-1170000
-8×
1084×
108-6.3×
1026×
1×
1039.06×
1051.3×
1053.29×
0.000502(精确到万分位)0.619535(精确到个位)
6.92603(精确到0.1)0.00686(精确到0.1)
(-—)3(-2)3(-2)262
-800000080000270000-4150000000
-20000011002900000-2720000000
-2×
1079×
106-2.4×
1036.01×
-1.8×
102-1.55×
105-5.1×
106-4.84×