简便计算方法42+126*58=?
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![简便计算方法42+126*58=?](/uploads/image/z/7261-61-1.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E6%96%B9%E6%B3%9542%2B126%2A58%3D%3F)
简便计算方法42+126*58=?
简便计算方法42+126*58=?
简便计算方法42+126*58=?
42+126*58
= 42*(126 - 125) + 126*58
= (42 + 58)*126 - 42*125
= 100*126 - (40 + 2)*125
= 12600 - 40*125 - 2*125
= 12600 - 5000 - 250
= 7600 - 250
= 7350