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12.6×7.6×2.32÷1.9÷1.4÷2.9的简便算法

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。

6.3÷1.4 =6.3/(0.7*2) =6.3/0.7/2 =9/2 =4.5

(1)2.8×7.6+1.4×2.8+2.8 =2.8×(7.6+1.4+1)=2.8×10=28(2)4.5×1.2-3.15÷15=5.4-0.21=5.19(3)[12.8-(7.5+4.5)]×2.5=[12.8-12]×2.5=0.8×2.5=2(4)0.65+2.7+0.35+7.3 =(0.65+0.35)+(2.7+7.3)=1+10=11(5)3.8×0.56+0.56×6.2=(3.8+6.2...

=4.06+28.8 =32.86

x=7-1.2 x=5.8 x=12.6➗6 x=2.1

(1)(7.5-4.5÷3)×1.4,=(7.5-1.5)×1.4,=6×1.4,=8.4;(2) 4 5 × 3 7 + 4 7 ÷ 5 4 ,= 4 5 ×( 3 7 + 4 7 ),= 4 5 ×1,= 4 5 ;(3) 11 8 - 7 11 × 5 7 - 6 11 ,= 11 8 - 5 11 - 6 11 ,= 11 8 -( 5 11 + 6 11 ),= 11 8 -1,= 3 ...

2.9 / 1.4 = 2.071428571428571 按照四舍五入原则,保留一位小数为: 2.1

3.9×1.4÷0.35 =3.9×(2*0.7)÷(0.5*0.7) =3.9*(2÷0.5) =3.9*4 =15.6 32.8×13.5÷4.5 =32.8×(4.5×3)÷4.5 =32.8×3 =98.4

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