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12.5X32X0.9简便计算

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

如图

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

960

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

5x32x25x125x6 =(8X125)X(4X25)X(6X5) =1000X100X30 =3000000 亲,你好 如果你认可我的回答,请及时点击【采纳为满意回答】按钮~ 手机提问者在客户端右上角评价点【满意】即可。 你的采纳是我前进的动力~~ ~如还有新的问题,请不要追问的形式发...

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

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!

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.

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