12.5×4.5＋4.5×12.5＋12.5的简便算法?
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12.5×4.5＋4.5×12.5＋12.5的简便算法?12.5×4.5＋4.5×12.5＋12.5的简便算法?12.5×4.5＋4.5×12.5＋12.5的简便算法?12.5×4.5＋4.5×12.
12.5×4.5＋4.5×12.5＋12.5的简便算法?
12.5×4.5＋4.5×12.5＋12.5的简便算法?
12.5×4.5＋4.5×12.5＋12.5的简便算法?
12.5×4.5＋4.5×12.5＋12.5
=12.5×（4.5+4.5+1）
=12.54×10
=125
把12.5提出来
=12.5x4.5+4.5x12.5+12.5x1
=12.5x(4.5+4.5+1)
=12.5x10
=125
=（4.5+4.5+1）*12.5
=10*12.5
=125