3.72×99简便计算,3.72*99=3.72*(100-1)=3.72*100-3.72=372-3.72=368.28
72*100-72=7200-72=7128
72×99+72简便方法=72x(99+1)=72x100=7200
3.72×99=3.72×(100-1)=3.72×100-3.72×1=372-3.72=368.28或者是72×99=72×(100-1)=72×100-72×1=7200-72=7128