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32X12.5X0.16简便计算

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960

12.5x32x0.7 =(12.5×8)×(4×0.7) =100×2.8 =280

12.5x32x0.125 =12.5x(4x8)x0.125 =(12.5x4)x(8x0.125) =50x1 =50 运用乘法结合律。 希望能帮到你!

12.5×32×0.9 =12.5×8×(4×0.9) =100×3.6 =360

12.5×32×2.5 =12.5×(2×2×8)×2.5 =12.5×2×2.5×2×8 =25×5×8 =25×40 =1000 另一种算法 12.5×32×2.5 =12.5×8×4×2.5 =(12.5x8)X(4x2.5) =100x10 =1000

(2)7.2X(36.3-16.3) (3)100X0.57+2X0.57

0.78Ⅹ32x12.5x2.5 =0.78×4×8×12.5×2.5 =0.78×(4×2.5)×(8×12.5) =0.78×10×100 =7.8×100 =780

方程两边同乘以2x(x+5),去分母得:6×2-3x=0,解得x=4.经检验x=4是原方程的解.故本题答案为:x=4.

12.5x32x0.025 =12.5x32x0.1/4 =12.5x0.1x(32/4) =1.25x8 =10

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