初一数学上册科学计数法和近似数32Word格式文档下载.docx
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103-3.97×
106
3、用四舍五入法对下列各数取近似数。
0.0000982(精确到万分位)2.60632(精确到十分位)
5.78075(精确到0.01)0.0698(精确到0.01)
4、计算。
2
(-—)3(-1)2(-4)413
3
-1300000-100007100000-37900
-200120050000000-10300
-1×
1049×
105-8.2×
1033.24×
108
3.4×
107-1.81×
1024.8×
1068.51×
105
0.000772(精确到万分位)29608.2(精确到十分位)
55.0798(精确到0.1)0.00523(精确到0.001)
1
(-—)3(-4)2(-1)342
1700003000000069000000-130000
-600000-300000008100-79500
9×
104-5×
108-7.1×
107-3.22×
102
4.6×
105-9.75×
102-2×
107-4.78×
0.0000915(精确到万分位)2675.48(精确到十位)
37.6363(精确到0.1)0.00938(精确到0.01)
(-—)3(-6)2(-4)453
9000007000000300-393000000
11000-47008800000-86800000
1×
107-3×
1072.6×
106-7.36×
-3×
102-8.5×
103-2.5×
1062.51×
0.0000958(精确到万分位)52.5313(精确到十位)
36.2364(精确到0.001)0.00828(精确到0.01)
(-—)2(-7)3(-4)412
-190000002006500000-38400
-14000-6000750000-66500
-9×
1034×
102-2.2×
1049.34×
103
-3.4×
107-1.76×
108-4.7×
108-1.89×
0.000926(精确到万分位)0.437501(精确到十分位)
89.07(精确到0.01)0.0791(精确到0.01)
4
(-—)3(-5)3(-4)473
5
-6000100000078000-4970000000
2000260000003800-773000
-5×
107-9×
103-2.4×
1084.26×
-1.8×
105-4.11×
1087.7×
1049.85×
0.000083(精确到万分位)8.46926(精确到个位)
1.67998(精确到0.001)0.0985(精确到0.001)
(-—)2(-8)2(-1)452
-120000-10000001300000-3390000
600000-33000670000-8450000000
-8×
1024×
1056.4×
103-5.07×
104
5.4×
1021.88×
107-4.2×
1062.93×
0.0000919(精确到万分位)0.749586(精确到十分位)
0.718566(精确到0.01)0.0083(精确到0.1)
(-—)2(-10)3(-1)253
180010000007400-2400000000
-16002500000094000-318000
8×
1044×
1023.6×
1027.62×
103-2.86×
1067.2×
107-6.88×
0.000743(精确到万分位)567.495(精确到个位)
49.9414(精确到0.01)0.0533(精确到0.001)
6
(-—)2(-4)3(-1)362
-170000008001700-24000000
-2000001000008100-2870000000
107-7.5×
102-4.77×
3.8×
106-1.06×
1066.9×
107-1.28×
0.000771(精确到万分位)75098.1(精确到个位)
0.292339(精确到0.1)0.00953(精确到0.001)
(-—)2(-8)3(-3)472
-15000-60000000400000-28500000
-50000160000002500000-1350000000
106-8×
1076.3×
102-6.07×
6.3×
1062.69×
108-1.6×
1066.86×
108