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75%乘1.375加5.625乘75%加0.75(简便运算)

=0.75*(1.375 5.625 1) =0.75*8 =6

(1)(13+216?512)×12=13×12+136×12-512×12,=4+26-5,=25;(2)[47?(18.75?1÷815)×2625]÷0.46=[47-(18.75-158)×5625]÷0.46,=[47-(18.75×5625-1.875×5625)]÷0.46,=[47-(42-4.2)]÷0.46,=[47-37.8]÷0.46,=9.2÷0.46,=20;(3)75%×1.37...

八分之五和百分之62.5都是0.625,这个式子中就有了三个0.625,把0.625提出来,把二分之一变成0.5,即=0.625*(0.5+1+0.5)=0.625*2=1.25

625-5/4+3/8-0.75 =625-5/4+3/8-3/4 =625-(5/4+3/4)+3/8 =625-2+3/8 =623又3/8

0.625x5.8+5/8x2.2 =5/8x5.8+5/8x2.2 =5/8x(5.8+2.2) =5/8x8 =5

0.625*5.8+5/8*3.2+5/8 =0.625*5.8+0.625*3.2+0.625 ==(5.8+3.2+1)*0.625 =10*0.625 =6.25

4/7×5/8+2/7×0.625+62.5%×10/7-2/7÷8/5 =4/7×5/8+2/7×5/8+5/8×10/7-2/7×5/8 =(4/7+2/7+10/7-2/7)×5/8 =2×5/8 =5/4

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脱式计算 4乘8分之5加62.5%乘7减0.625 =4x0.625+0.625x7-0.625 =(4+7-1)x0.625 =10x0.625 =6.25

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