如题所述
125x25x32
简便1:先把32分解成8×4,此题变成,
125x25x8×4,根据乘法交换率和结合律,可以得出
(125x8)x(25×4)
=1000x100
=100000
简便2:先把25分解成5x5,此题变成,
125x5x5x32,根据乘法交换率和结合律,可以得出
(125x5)x(5x32)
=625 x160
=100000
简便1:先把32分解成8×4,此题变成,
125x25x8×4,根据乘法交换率和结合律,可以得出
(125x8)x(25×4)
=1000x100
=100000
简便2:先把25分解成5x5,此题变成,
125x5x5x32,根据乘法交换率和结合律,可以得出
(125x5)x(5x32)
=625 x160
=100000
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