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72X27十72X72十72竖式计算,怎

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提取公因式,将72提出来,即72X(27+72),然后就是72X99 = 72X(100-1)=7200-72

35x27+35x72+35 =35x(27+72+1) =35x100 =3500

原式 =24x72+12x56 =24x72+12x2x28 =24x72+24x28 =24x(72+28) =24x100 =2400

=31x(27+72+1) =31x100 =3100用乘法运算定律计算下面各题27x31十3|x72十31

47x72十47x27十47 =47x(72十27+1) =47x100 =4700

95×72-72×11+16×72 =(95-11+16)×72 =100×72 =7200

原题 = 69 * (72+29-1) = 68*100 = 690

=6.28x72+6.28x28 =6.28x(72+28)=6.28x100 =628

272x72十72x28 =(272+28)x72 =300x72 =21600

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