12.5x79+12.5x2-12.5简便算法
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12.5x79+12.5x2-12.5简便算法
12.5x79+12.5x2-12.5
=12.5x(79+2-1)
=12.5x80
=1000
12.5x79+12.5x2-12.5
=12.5*（80-1）+12.5*（2-1）
=125*8-12.5+12.5
=1000
=12.58＊（79+2-1）
12.5x79+12.5x2-12.5简便算法
12.5x79+12.5x2-12.5
=12.5x(79+2-1)
=12.5x80
=1000
12.5x79+12.5x2-12.5
=12.5*（80-1）+12.5*（2-1）
=125*8-12.5+12.5
=1000
=12.58＊（79+2-1）