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18.8÷[0.2×(7.6%2.9)]用简便计算

18.8÷[0.2×(7.6-2.9)] =18.8÷[0.2×4.7] =18.8÷0.2÷4.7 =18.8÷4.7÷0.2 =4÷0.2 =20

原式 =(12.6÷1.4)x(7.6÷1.9)x(2.32÷2.9) =9x4x0.8 =36x0.8 =28.8 供参考。

将除号后半部分分解为3*9,5*5,3*8,2*11,与前半部分可同比消除,1可省略,最后剩下(4*2*7*2)=112口算即可得

(1)337-298=337-300+2,=37+2,=39;(2)0.8-0.2×1.9÷7.6=0.8-0.38÷7.6.=0.8-0.05,=0.75;(3) 7 13 ÷8+ 1 8 × 5 13 = 7 13 × 1 8 + 1 8 × 5 13 ,=( 7 13 + 5 13 )× 1 8 ,= 12 13 × 1 8 ,= 3 26 ;(4) 6 7 -( 4 5 - 1 7 ) = 6 7 +...

1÷2×3÷3×4……÷8×9 =1÷2×9 =9/2

0.8-0.2×1.9÷7.6 =0.8-0.38÷7.6 =0.8-38÷76÷10 =0.8-0.05 =0.75

原式=(1+29)x29÷2 =30x29÷2 =870÷2 =435 或者: (1+29)+(2+28)+(3+27)+……+(14+16)+15 =30+30+30+……+30+15 =30x14+15 =420+15 =435

0.5×5=2.5 0.18+0.82=1 2.1+0.6+7.9=10.6 0.6÷0.2=3 0.09×1000=90 0.8×3.5×0.125=0.35 1.2÷4=0.3 5.52÷100=0.0552 1.3×3÷10=0.39 0.72÷6=0.12 5.52÷0.01=552 5÷0.5÷2=5 3.9-3=0.9 0.1×6.9=0.69 0.9+0.9÷0.9=1.9

①16×18-120÷15,=288-8,=280;②3.2×2.77+0.23×3.2,=3.2×(2.77+0.23),=3.2×3,=9.6;③7.6-2.05÷0.82,=7.6-2.5,=5.1;④ 7 8 - 5 17 + 9 8 - 12 17 ,=( 7 8 + 9 8 )-( 5 17 + 12 17 ),=2-1,=1;⑤ 2 9 - 7 16 × 2 9 ,= 2 9 ×(1- 7 ...

1+2+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1 =(1+9)+(2+8)+...(9+1)+10 =10*10 =100

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