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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。

(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 +...

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

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

9.6÷(4.8×7.2+2.8×4.8) =9.6÷[4.8*(7.2+2.8) =9.6÷(4.8*10) =9.6÷48 =0.2

8.4÷7.6÷(4.2÷1.9) =8.4/7.6÷4.2/1.9 =8.4/7.6x1.9/4.2 =2/4 =1/2 =0.5 谢谢,请采纳

11.9÷0.6-0.7÷0.6 =(11.9-0.7)÷0.6 =11.2÷0.6 =56/3

5/7-1/12+2/7-11/12 =(5/7+2/7)-(1/12+11/12) =1-1 =0

6.7×9.9+0.67×2 =6.7×9.9+6.7×0.2 =6.7×(9.9+0.2) =6.7×10.1 =6.7×(10+0.1) =6.7×10+6.7×0.1 =67+0.67 =67.67

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