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简便计算12.5x56

12.5X56 =(12.5X8)X7 =100X7 =700

12.5x2.5x6=2.5x5x2.5x6=2.5x30=6.25x30=62.5x3=187.5

125*56=125*8*7=1000*7=7000 亲,利用乘法结合律.

56x12.5=7x8x12.5=7x100=700

把56分解成7和8,用125和8相乘结合,在与7乘

(1)56*12.5,=7*(8*12.5),=7*100,=700;(2)14.6-(4.6+7.2),=14.6-4.6-7.2,=10-7.2,=2.8;(3)99*99+199,=99*99+99+100,=99*(99+1)+100,=99*100+100,=9900+100,=10000.

12.5X69+53x3.1+72x3.1=125X6.9+(53+72)X3.1=125X10=1250

125x56=125*(8*7)=125*8*7=1000*7=7000

100*56+2*56=5600+112=5712

125x56=125*8*7=7000

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