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计算:(1)(2×10-6)×(3.14×107)(2)(3×10-
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(1)(2×10-6)×(3.14×107)
=(2×3.14)×(10-6×107)
=6.28×10
=62.8;
(2)(3×10-2)2÷(10-2)3
=9×10-4÷(10-6)
=9×10-4-(-6)
=9×102
=900.
=(2×3.14)×(10-6×107)
=6.28×10
=62.8;
(2)(3×10-2)2÷(10-2)3
=9×10-4÷(10-6)
=9×10-4-(-6)
=9×102
=900.
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