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1.2x2.5+0.8x2.5的简便算法是什么?

2.5x(1.2+0.8)

1.2x2.5+0.8x2.5 =(1.2+0.8)x2.5 =2x2.5 =5

2.5x(1.2+o.8) =2.5x2 =5

2.5×(1.2+0.8)=5

原式=(1.2+0.8)×2.5 =2×2.5 =5

原式 =1.2x2.5+0.8x2.5 =(1.2+0.8)x2.5 =2x2.5 =5 或者 =0.3x4x2.5+2x4x0.25 =0.3x10+2x1 =3+2 =5 供参考。

什么?

等于(1.2乘以2.5)乘以(0.8乘以2.5)等于3乘以2等于6

提取公因数2.5: 1.2X2.5+0.8X2.5 =2.5X(1.2+0.8) =2.5X2 =5

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