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下面各题简便计算过程1,(5/8+5/8)乘4/25 2,(5...

(5/8+5/6)÷4/25 =(5/8+5/6)×25/4 =5/8×25/4+5/6×25/4 =125/32+125/24 =875/96 =9又11/96

5.1除以(4.25乘0.8) =5.1÷3.4 =(3×1.7)÷(2×1.7) =3÷2 =1.5

(1)2 3 4 -1.375+7.25-6 5 8 ,=2.75+7.25-(1.375+6.625),=10-8,=2;(2)888 8 9 ×1.125.=888×1.125+ 8 9 × 9 8 ,=999+1,=1000;(3)2000-1999×0.83-199.9×1.7.=2000-(1999×0.83+1999×0.17),=2000-1999×(0.83+0.17),=2000-19...

(-270)乘四分之一+0.25乘21.5+(-8又2分之1)乘(-25%)=(-270+21.5+8.5)×0.25=-240×0.25=-60

4/13-2/15*4/13 =4/13(1-2/15) =4/13*13/15 =4/15 1/8*25*5/4*32 =1/8 * 32 * 25 *5/4 =5*25 =125

一、口算下面各题。(23分) 10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04= 12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6= 400÷125÷8= 1.9×4×0.5= 80×0.125= 3× = 6 6= 2 -( + )= 10 2= 3.2×7÷3....

=1/5×8×5/4 =8/5×5/4 =2

35×40-315除3=1400-105=1295 8×25×125×4=(8×125)×(25×4)=1000×100=100000

4.8×0·25==4.8*1/4=1.2 0.78×98=0.78*(100-2)=78-1.56=76.44 0.5×2.33×8=2.33*4=9.32 1·5×105=1.5*(100+5)=150+7.5=157.5 0·3×2·5×0·4=0.3*1=0.3 1·2×2·5+0.8×2·5=2.5*(1.2+0.8)=2.5*2=5

规律:下一个数等于上一个数乘以2/5,所以下个是8/125,16/625

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