人教版七年级数学上册科学记数法和近似数综合练习题精选88Word文档格式.docx
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107-6.8×
102-3.59×
104
3、用四舍五入法对下列各数取近似数。
0.0000655(精确到万分位)613.328(精确到十位)
22.8729(精确到0.1)0.00622(精确到0.01)
4、计算。
1
(-—)3(-1)3(-2)362
3
4000070000070000-6530000
1200500000003200-595000000
2×
108-6×
1071.7×
1062.68×
108
6.7×
108-3.56×
1047.5×
108-9.82×
102
0.0000563(精确到万分位)4973.6(精确到个位)
0.923332(精确到0.001)0.0593(精确到0.1)
4
(-—)2(-9)2(-4)252
5
16000000900020000-575000000
-2000-420000004400-62700
-8×
1089×
1077.8×
107-6.68×
-7.4×
105-7.19×
104-6.3×
104-7.79×
0.0000635(精确到万分位)15.717(精确到十位)
89.4305(精确到0.01)0.00967(精确到0.1)
(-—)2(-3)2(-2)283
13000-900660000-62200000
-20000110000073000000-50000000
-5×
1087×
102-6.7×
105-2.58×
103
1.9×
106-6.43×
108-7.6×
1068.13×
105
0.0000556(精确到万分位)9.82427(精确到十分位)
0.758865(精确到0.001)0.00953(精确到0.1)
(-—)3(-1)2(-2)463
2
-1600000-200008200-4860000
-180048000008300000-166000000
3×
103-6×
103-2.7×
1077.05×
1×
104-7.98×
1029.6×
1074.71×
0.000973(精确到万分位)6.93733(精确到个位)
9.7975(精确到0.001)0.0563(精确到0.1)
(-—)2(-10)3(-4)253
-190000-50000000810000-6800000
500000-11000009200000-737000
-2×
103-1×
103-9.1×
1026.13×
106
8.1×
105-5.82×
103-3.1×
104-2.24×
0.000522(精确到万分位)6.03629(精确到十分位)
0.695987(精确到0.001)0.0852(精确到0.1)
(-—)3(-4)2(-1)343
1500000-800000001300000-1600000
3000-27009700-32000
1024×
1063.2×
1036.48×
-8.9×
102-4.99×
105-8.1×
106-5.51×
0.000502(精确到万分位)58.0539(精确到十位)
0.241922(精确到0.001)0.00721(精确到0.1)
(-—)2(-1)2(-3)293
4000000-80000000480000-429000
-15000240000000600000-42700
1022×
1063.5×
1044.61×
-1.8×
1056.41×
1049.1×
104-3.15×
0.0000709(精确到万分位)8.19426(精确到十分位)
0.282883(精确到0.001)0.0774(精确到0.001)
(-—)2(-6)2(-2)283
1000-4000890000-18300000
-1200000-110000050000000-117000
9×
104-5×
1053×
1026.6×
-2.1×
1049.87×
1085.9×
1053.56×
0.0000634(精确到万分位)15223.8(精确到个位)
0.694598(精确到0.1)0.00994(精确到0.1)
(-—)3(-4)3(-2)343
1800000-10000002100-1110000000
200-120000000280000-48600
-7×
105-5×
1052.3×
106-1.28×