简便方法:1600-(1200-1200*3/4)

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简便方法:1600-(1200-1200*3/4)简便方法:1600-(1200-1200*3/4)简便方法:1600-(1200-1200*3/4)1600-(1200-1200*3/4)=1600

简便方法:1600-(1200-1200*3/4)
简便方法:1600-(1200-1200*3/4)

简便方法:1600-(1200-1200*3/4)
1600-(1200-1200*3/4)
=1600-1200+1200*3/4
=400+900
=1300