1、(4) 2、用科学记数法表示下列各数。5000000 600 450000 379000000 60000 47000000 48000 20600000 3、下列用科学记数法写出的数,原来分别是什么数?4107 9106 1107 1.13102 2.6105 4.49103 8.7107 5.11103 4、对下列各数取近似数。0.000782(精确到万分位) 945.747(精确到个位) 0.235128(精确到0.001) 0.00978(精确到0.1) (8)2 (4)3 (1)2 (13)2 3 ()2 (6)3 (5)2(1)2 4(4)24(8)13 (2)2(7)(4)2(5
2、) (1)3(3)(1)32(3)2(3) ()24(2)3 (1)5(8)2(412)5 19 1 1 3 6 ()7 6 6 19 5 (1)3(3)(3)38000000 50000000 30000 3400000 150000 27000000 8500 9650000000 5103 8105 1.7106 4.62105 8.3106 1.39107 3.7103 2.110.000696(精确到万分位) 981.329(精确到个位) 0.569405(精确到0.01) 0.0918(精确到0.001) (2)3 (1)3 (5)2 (0.08)2()3 (4)2 (9)2(9)
3、2 6(1)39(9)19 (2)3(3)(2)2(2) (3)3(3)(1)28(4)3()3(2)3 (0.1)4(9)2(422)2 19 1 1 2 1 2 2 4 19 3 (4)3(9)(4)2(2) 19000000 100000 3400 2460000000 1900000 46000 340000 87500000 2104 2102 7.9108 2.2 7104 5.46105 1.3102 8.170.000987(精确到万分位) 2.3015(精确到十分位) 0.210006(精确到0.01) 0.0889(精确到0.01) (3)3 (5)4 (2)3 (1.3)
4、2()3 (9)2 (6)2(3)2 2(3)35(7)9 (1)3(4)(4)2(4) (4)2(4)(1)28(1)3()22(3)3 (0.1)5(5)2(912)13 1 1 9 4 9 5 3 13 5 (3)3(8)(4)2 700 6000000 410000 32000 17000000 440000000 6200000 8120000 9102 2108 4.2107 44.8102 7.97107 6.9108 7.79108 0.000847(精确到万分位) 41075.3(精确到十分位) 0.394261(精确到0.1) 0.0928(精确到0.1) (3)2 (3)
5、3 (4)2 (0.14)2()2 (10)2 (6)2(4)23(2)13 (3)3(3)(1)2(3) (3)3(2)(2)24(2)3(6) ()2(2)2 (10)4(9)2(762)19 1 1 5 1 4 3 5 19 3 300 2000 32000000 18500000 800 14000000 5600000 724000 106 7103 9.9107 4.38 1.6105 8.63104 9.4106 1.250.000722(精确到万分位) 5.84622(精确到十分位) 0.637815(精确到0.001) 0.00905(精确到0.01) (7)2 (1)3 (
6、1)4 (0.14)2 6 ()3 (9)3 (7)2(2)2 7 (3)35(3)2 (4)2(7)(2)2(1)3(2)(2)22(2)2()36(1)3 (10)3(6)2(932)6 13 1 1 7 6 3 2 4 13 5 (3)2(7)(1)2130000 9000 97000000 499000 900 160000 1200000 1200000000 1107 5104 6.9108 2.047.3106 9.94106 7.1105 6.50.000755(精确到万分位) 33.3963(精确到个位) 8.19977(精确到0.1) 0.00743(精确到0.01) (7
7、)3 (5)4 (3)3 (130)2()2 (3)3 (5)2(9)1 (4)3(5)(3)2(4)2(8)(3)23(3)3()26(4)3 (0.1)4(10)2(542)17 1 1 6 1 3 3 4 17 2 (3)2(3)900000 700 5900 696000 90000 260000000 62000000 560000000 105 9108 7.9104 2.12104 2.7107 9.6104 3.7104 7.240.000534(精确到万分位) 42.547(精确到个位) 0.676446(精确到0.01) 0.0597(精确到0.001) (10)2 (4)
8、2 (2)3 (9)2()3 (1)3 (8)2(6)2 (2)33(6)7 (1)2(7)(4)3(1)2(7)(4)29(3)2()3(1)3 (1)4(5)2(462)19 1 1 7 1 7 2 3 19 2 (3)2(5)(3)2 7000000 9000 9900000 5220000000 100000 10000 1400000 59300 3108 5106 7.5103 6.07106 6.2106 2.75104 5.9104 4.930.000524(精确到万分位) 96866.1(精确到个位) 0.956871(精确到0.1) 0.00554(精确到0.001) (3
9、)3 (6)2 (2)2 (11)2 9 ()2 (8)3 (1)2 8 (7)13 (4)3(3)(1)2(1)3(9)(3)31(4)3()25(3)3 (0.1)4(1)2(462)3 11 1 1 2 4 3 5 6 11 3 (3)3(7)(4)2 1500000 100000 37000000 52900 1800 4000000 5600000 7330000 8104 3106 7.9105 5.26 7.3107 6.38108 7.4107 4.720.000835(精确到万分位) 8796.81(精确到十分位) 93.6907(精确到0.01) 0.0577(精确到0.001)
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