50.9*1.9*1.9-1.8简便计算
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50.9*1.9*1.9-1.8简便计算
![50.9*1.9*1.9-1.8简便计算](/uploads/image/z/18114179-59-9.jpg?t=50.9%2A1.9%2A1.9-1.8%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
50.9*1.9*1.9-1.8
=50.9*(2-0.1)*(2-0.1)-1.8
=50.9*(4-0.2-0.2+0.01)-1.8
=(50+0.9)*3.61-1.8
=180.5+3.249-1.8
=181.949
=50.9*(2-0.1)*(2-0.1)-1.8
=50.9*(4-0.2-0.2+0.01)-1.8
=(50+0.9)*3.61-1.8
=180.5+3.249-1.8
=181.949