20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
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20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
![20.5*3.45+(3.67-2.39)简便计算 要求简便计算,](/uploads/image/z/546559-7-9.jpg?t=20.5%2A3.45%2B%283.67-2.39%29%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97+%E8%A6%81%E6%B1%82%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C)
20.5*3.45+(3.67-2.39)
=(20+0.5)*3.45+1.28
=20*3.45+3.45/2+1.28
=69+1.725+1.28
=72.005
=(20+0.5)*3.45+1.28
=20*3.45+3.45/2+1.28
=69+1.725+1.28
=72.005