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脱式计算:(1)8/9×[7/8%(7/16%1/8)](2)10×3...

(1)8/9×[7/8-(7/16-1/8)](2)10×3/4+17×75%-7×0. =8/9×[7/8-7/16+1/8] =8/9×[7/8+1/8-7/16] =8/9×[1-7/16] =8/9×9/16 =1/2 (2)10×3/4+17×75%-7×0.75 [3/4=75%=0.75] =0.75×(10+17-7) =0.75×20 =15

4.71×3.2+4.71×7.8-4.71 =4.71x(3.2+7.8-1) =4.71x10 =47.1

80/72

直接用通分法即可: 原式=(3/8+1/4)+3/7-2/9 =(3+2)/8+3/7-2/9 =5/8+3/7-2/9 根据7,8,9最小公倍数是7×8×9=504 =(5×63+3×72-2×56)/504=419/504

(1)9.8×75+75×0.2,=(9.8+0.2)×75,=10×75,=750;(2)0.78÷0.25÷40,=0.78÷(0.25×40),=0.78÷10,=7.8;(3)7.2+2.8×5.06,=7.2+14.86,=21.368;(4)56×10.1,=56×(10+0.1),=56×10+5.6×0.1,=560+0.56,=560.56.

8/13*1/7+1/7*6/13=1/7(8/13+6/13)=2/13

=9/8+7/8+(1/9+8/9) =2+1 =3

1/6+1/3+1/2 =1/6+2/6+3/6 =1 8/15+(7/30-1/5) =16/30+7/30-6/30 =17/30 6/7-(1/7+1/2) =6/7-1/7-1/2 =12/14-2/14-7/14 =2/14 9/10-(1/4-1/6) =9/10-1/4+1/6 =54/60-15/60+10/60 =49/60

(1+99)×99/2

一、脱式计算(能简便的要简便)1) 12.53-1.35×2+7.32) 7.12×0.81+7.12×1.193) 0.15+(3.74-1.8)÷0.44) 18.6×[0.1÷(8.1-8.09)]5) 1/5+4/5×1/9÷4/96) 2/15÷(19/21+3/7)×207) (2/5-3/4×8/15)÷5/28) 9×[1-(2/5+9/20)]9) X/3.5=...

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