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72x29 72简便计算

72X29十70X71十71=(71+1)X29十70X71十71=71X29+1X29十70X71十71=71X(29+71)+(29+71)=71X100+100=7100+100=7200

72*99+72=72*(99+1)=72*100=7200

72X101一72的简便计算72X101一72=72*(101-1)=72*100=7200

72*101-72=72*101-72*1=72*(101-1)=72*100=7200

72x29-531=2088-531=1557没有简算,直接计算

29x72=72x(30一1)=72x30一72=2160-72=2088

=72x(99+1)=72x100=7200

可以这么算72x27+72x72=72*(27+72)=72*99=72*(100-1)7200-72=7128

72*38+72*61+72=72*(38+61+1)=72*100=7200

=72*(72÷9)=72*8=576

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