0.5x(4.2-0.8)-0.45的简便算法
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0.5x(4.2-0.8)-0.45的简便算法
![0.5x(4.2-0.8)-0.45的简便算法](/uploads/image/z/16424607-39-7.jpg?t=0.5x%284.2-0.8%29-0.45%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95)
0.5×(4.2-0.8)-0.45
=0.5×(4.2-0.8)-0.5×0.9
=0.5×(4.2-0.8-0.9)
=0.5×2.5
=1.25
=0.5×(4.2-0.8)-0.5×0.9
=0.5×(4.2-0.8-0.9)
=0.5×2.5
=1.25