初一数学上册科学计数法和近似数14文档格式.docx
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1034.76×
104
3、用四舍五入法对下列各数取近似数。
0.000643(精确到万分位)48.6077(精确到十位)
3.63659(精确到0.1)0.0087(精确到0.001)
4、计算。
6
(-—)3(-1)3(-4)473
5
-2000-7005200000-5800
18000000-380089000-63100000
-5×
108-5×
1067.8×
107-9.1×
105
-7.1×
1033.19×
104-2.8×
1088.99×
107
0.000627(精确到万分位)0.722577(精确到个位)
0.738527(精确到0.01)0.00504(精确到0.001)
3
(-—)2(-6)2(-1)412
4
50000-3000000130000-6400000
-15004800020000-7340000000
-6×
102-1×
1036.4×
105-7.92×
108
-2.4×
1035.36×
1079.6×
1037.95×
102
0.0000901(精确到万分位)0.639093(精确到十分位)
3.27009(精确到0.1)0.056(精确到0.001)
1
(-—)2(-3)3(-4)472
800-40061000-95400
600-40011000-310000
-7×
105-7×
1063×
102-9.77×
103
6.3×
102-3×
1038.2×
107-6.82×
0.000505(精确到万分位)0.886785(精确到个位)
0.372545(精确到0.01)0.0954(精确到0.001)
(-—)2(-3)2(-1)373
-150008000040000-212000
60000003300000044000-95600
5×
1031×
106-2.8×
106-7.61×
104-5.82×
106-1.3×
106-3.74×
0.000565(精确到万分位)60.095(精确到十分位)
1.91257(精确到0.01)0.00994(精确到0.01)
(-—)3(-10)2(-3)283
-8000500084000000-88800000
-7000032000019000-39300
9×
1027×
1051.2×
108-8.5×
1029.75×
103-3×
103-4.57×
0.000518(精确到万分位)4.14748(精确到十位)
8.11869(精确到0.1)0.00608(精确到0.1)
(-—)3(-5)2(-2)263
-11000000200006300-84800
-160000-2900086000-84500000
1084×
1062.6×
1064.53×
-8.3×
108-2.89×
1026.7×
1067.16×
0.0000849(精确到万分位)3799.11(精确到个位)
0.708294(精确到0.001)0.0501(精确到0.1)
(-—)2(-6)3(-2)252
-700-9000000068000-3300000000
-7003500000007000-6720000000
-8×
1043×
1047.2×
107-9.76×
-9.5×
108-1.9×
107-9.9×
1063.88×
0.0000886(精确到万分位)0.657967(精确到十分位)
4.04886(精确到0.01)0.00654(精确到0.1)
(-—)2(-5)2(-3)463
-110000-8000000980000-8090000
1100000-180000700000-261000
-4×
104-5×
104-9.8×
1023.4×
-1×
107-1.74×
1069.9×
106-2.83×
0.000647(精确到万分位)968.091(精确到个位)
89.7798(精确到0.1)0.086(精确到0.001)
(-—)3(-10)2(-4)233
2
200050000006000-11400
-1500000-36000000061000-1700000
1053×
108-9.5×
1052.81×
-3.6×
107-2.37×
1071.1×
1051.69×