0.64x9.9 3.14x99+3.14 0.4 - 知识问答

0.64x9.9 3.14x99+3.14 0.45x7.5-0.45x6.5 0.25x3.5x4x2用简便计算怎么算

3个回答

(1)0.64x9.9
=0.64x(10-0.1)
=0.64x10-0.64x0.1
=6.4-0.064
=6.336
(2)3.14x99+3.14
=3.14x(99+1)
=3.14x100
=314
(3)0.45x7.5-0.45x6.5
=0.45x(7.5-6.5)
=0.45x1
=0.45
(4)0.25x3.5x4x2
=(0.25x4)x(3.5x2)
=1x7
=7

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