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0·125x7.5的简便方法

0·125x7.5 =0.125×(7-0.5) =0.125×8-0.125×0.5 =1-0.0625 =0.9375

1.25x2.5十125x7.5 =1.25x100x2.5/100十125x7.5 =125x0.025+125x7.5 =125x(0.025+7.5) =125x7.525 =940.625

20-0.125x=7.5 0.125x=12.5 x=100

2.5x=1 x=1÷2.5 解得,x=0.4

2.5x=0.125*8 2.5x=1 x=0.4

尽快回家看了就看见以后贫困【让我iothgujhfkkldjjk

3.6x(2.5十7.5)=36。 0.125x8x4=4。 3.25x(99+1)=325。 3.8x(10+0.1)=38+0.38=38.38。

(10-7.5)X=0.125×8 2.5X=1 X=1÷2.5 X=0.4

x=0.4

解方程: X=1*2,5 X=0,4 检验 (10—7 ,5)x0,4=1 右边0,125x8=1 左边=右边

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