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

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0.64x9.93.14x99+3.140.45x7.5-0.45x6.50.25x3.5x4x2用简便计算怎么算0.64x9.93.14x99+3.140.45x7.5-0.45x6.50.25x3

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

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

0.64×(10-0.1)=6.4-0.64×0.1=6.4-0.064=6.336
3.14×(99+1)=314
0.45×(7.5-6.5)=0.45
(0.25×4)×(3.5×2)=1×7=7

0.64x9.9
=0.64*(10-0.1)
=6.4-0.064
=6.336
3.14x99+3.14
=3.14*(99+1)
=3.14*100
=314
0.45x7.5-0.45x6.5
=0.45*(7.5-6.5)
=0.45
0.25x3.5x4x2
=3.5*2*1
=7 .