初一数学上册科学计数法和近似数188Word格式文档下载.docx
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108-1.84×
103
3、用四舍五入法对下列各数取近似数。
0.000549(精确到万分位)2619.48(精确到十分位)
0.518968(精确到0.1)0.0573(精确到0.001)
4、计算。
4
(-—)3(-4)3(-2)223
5
14000000-6000000016000000-410000
120037003400-1290000
7×
106-3×
102-5.5×
102-1.22×
102
-1×
106-3.56×
1041.4×
108-4.57×
106
0.000697(精确到万分位)0.969114(精确到十位)
0.158197(精确到0.1)0.0514(精确到0.1)
1
(-—)2(-4)2(-2)332
2
-1600001000009500-3900000
20000002000000001500000-3010000
-7×
1072×
106-6.4×
106-4.5×
105
-5.3×
104-7.24×
1051.6×
102-5.67×
107
0.000848(精确到万分位)134.365(精确到个位)
0.90586(精确到0.01)0.00596(精确到0.1)
(-—)3(-9)2(-3)423
3
-300-1000057000-173000
-200000150000002100000-240000000
1043×
108-1.9×
105-4.61×
5.3×
103-2.25×
104-7.8×
1028.3×
0.0000572(精确到万分位)85585.6(精确到个位)
30.981(精确到0.001)0.00855(精确到0.1)
(-—)3(-5)3(-2)432
-11000-70000170000-19400000
-70000001800064000-803000000
8×
1065×
107-7.1×
1053.91×
108
1.2×
1087.44×
105-6.8×
1058.32×
0.0000516(精确到万分位)29037.3(精确到十分位)
0.876265(精确到0.01)0.0705(精确到0.001)
(-—)3(-3)2(-1)363
-2000-50000010000-51300000
19002400290000-798000000
-8×
106-4×
106-7.7×
1074.22×
-3.7×
1023.99×
1067.1×
106-8.38×
0.000712(精确到万分位)89.8729(精确到十分位)
49.0151(精确到0.1)0.00971(精确到0.01)
(-—)2(-2)3(-1)442
-5000002000006100-83000
-170004300000450000-3760000
-5×
105-1.5×
1044.41×
7.9×
105-5.13×
1052.1×
1059.23×
0.000075(精确到万分位)53.0513(精确到十位)
19.1256(精确到0.1)0.0618(精确到0.1)
(-—)3(-9)3(-3)313
-3000-5000009300-5040000000
2000000-2500000270000-1280000000
1×
1027×
1083.8×
106-7.15×
3.6×
108-7.82×
106-4.3×
1087.09×
0.0000767(精确到万分位)169.17(精确到十位)
27.247(精确到0.01)0.0801(精确到0.1)
(-—)2(-8)3(-4)213
-300008000040000-37000
5000-340000009800-8970000000
108-9×
104-7.3×
105-2.01×
2.1×
1048.6×
106-9.9×
1085.73×
0.0000924(精确到万分位)1.71886(精确到个位)
7.92783(精确到0.01)0.00995(精确到0.01)
(-—)3(-9)2(-2)473
700000800000008700000-443000000
-150001800690000-387000000
-6×
108-1×
1073.2×
108-2.12×
-9.9×
1049.42×
1037.5×
102-6.53×
103