初一数学上册科学计数法和近似数171Word下载.docx
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103-8.03×
103
3、用四舍五入法对下列各数取近似数。
0.0000989(精确到万分位)694.108(精确到十位)
6.40769(精确到0.01)0.0567(精确到0.001)
4、计算。
6
(-—)3(-8)2(-1)362
5
20000003000000068000-94900
-700003300000058000000-4640000
8×
106-8×
102-3×
1053.54×
108
-6.3×
103-7.4×
1065.6×
1063.94×
104
0.0000698(精确到万分位)67.4147(精确到个位)
94.6916(精确到0.1)0.0933(精确到0.01)
4
(-—)2(-2)2(-1)312
-900000-20070000-9380000000
16000004500005400-998000
-4×
104-2×
103-8.7×
102-3.78×
6×
107-4.01×
1021.1×
104-9.73×
102
0.000596(精确到万分位)9.91578(精确到十分位)
37.3435(精确到0.001)0.00801(精确到0.001)
3
(-—)2(-10)3(-3)293
80000020000000930000-23500
200-1900990000-976000
102-4×
106-2.4×
1065.65×
5.4×
1054.1×
1051.4×
107-9.61×
0.0000881(精确到万分位)66.7637(精确到十位)
64.9763(精确到0.1)0.00768(精确到0.001)
1
(-—)3(-7)2(-4)362
17000-200000400000-495000
2000003001700000-86200
103-9×
1037.1×
105-3.07×
-5.8×
102-2.32×
1028.9×
1043.44×
107
0.0000942(精确到万分位)3.06329(精确到个位)
26.6475(精确到0.01)0.00957(精确到0.01)
(-—)3(-6)3(-4)493
1800003000380000-9510000000
-2000-340029000000-8740000
-5×
1047×
1033.6×
1055.16×
-9.9×
102-2.5×
1071.6×
105-8×
0.0000926(精确到万分位)2.16996(精确到十位)
9.13829(精确到0.1)0.0543(精确到0.1)
(-—)3(-1)3(-1)493
2
-1000-600340000-65000
1800000-1000070000000-458000
3×
1062×
104-5.7×
104-7.99×
5.5×
1077.62×
108-3.3×
102-2.61×
0.000927(精确到万分位)3638.75(精确到十分位)
7.61275(精确到0.01)0.00553(精确到0.1)
(-—)2(-2)2(-1)453
-1000-5000000800000-564000000
120000230000001100000-596000
4×
105-3×
1057.8×
1058.73×
1066.15×
1088.9×
105-8.52×
0.0000998(精确到万分位)2.08622(精确到十分位)
0.7092(精确到0.001)0.00533(精确到0.1)
(-—)3(-8)2(-2)463
200002000000084000-62600
18000000-4500002700000-8230000000
106-2×
107-5.3×
1068.17×
-7.8×
104-9.6×
108-6.8×
1059.65×
0.0000933(精确到万分位)0.972117(精确到十分位)
79.6376(精确到0.1)0.0091(精确到0.01)
(-—)2(-10)3(-3)282
-200000900000009900-1170000
-30000-150002500-3560000
-8×
1072×
105-7.8×
1038.52×
4.7×
104-7.81×
107-7.8×
1024.04×