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75%乘1.375加5.625乘75%加0.75(简便运算)

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

6.25x3.77+3.75x0.377 =3.77x(6.25+0.375) =3.77x6.625 =4x6.625-0.2x6.625-0.03x6.625 =26.5-1.325-0.19875 =25.175-0.19875 =25.175-0.2+0.00125 =24.97625

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

原式 =0.125 +1.375+ 2.75 +3.875 +4.25 +5.625 =(0.125+3.875)+(1.375+5.625)+(2.75+4.25) =4+7+7 =18 供参考。

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

=3.75*(735-573)+16.2*62.5 =3.75*162+162*6.25 =162(3.75+6.25) =1620 简便计算;5.3乘7.5加0.33乘0.75乘14 4.52乘4.8加9.6乘2.74 5.3X7.5+0.33X0.75+144.52X4.8+9.6X2.74 =5.3X7.5+0.33X0.75+72.26X9.6+9.6X2.74 =5.3X7.5+0.33X0.75+(72.26+2.7...

0.625 X 1又四分之一 + 8分之3 X 1.75 =5/8 X 5/4 + 3/8 X 7/4 =(1-3/8) X 5/4 + 3/8 X 7/4 =5/4 - 3/8 X 5/4 + 3/8 X 7/4 =5/4 + (7/4 - 5/4) X 3/8 =5/4 + 1/2 X 3/8 =20/16 + 3/16 =23/16

(1)18乘以(6分之5+9分之7) =18×5/6+18×7/9 =15+14 =29 (2)0.625除以7分之5加5分之7乘以8分之3 =(0.625+3/8)×7/5 =1×7/5 =1.4 (3)4分之1除以4分之7加4分之1乘以7分之3 =1/7+3/28 =1/4

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

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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