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51x8 7x51Qx5简便计算

8/7x5/4x14/15=4x2/7x5/4x14/15=2x5/7x2x7/(3x5)=4/3

49x38 51x38简便运算49x38 51x38=38*(49+51)=38*100=3800

65x8+7x65一65x5=65x(8+7-5)=65x10=650

原式=51000÷51÷8=1000÷8=125供参考.

25*(51x8)=25x4x2x51=100x102=10200

12x6x5=12x(6x5)=12x30=360

原式等于8*(129+51)=1440 回答完毕~~~~

65x8+7x56-56x5=8x(65+49-35)=8x79=8x(80-1)=640-8=632

7x5/8+5x5/8=(7+5)*5/8=12*5/8=7.5

8.9x5 +6.8x5=(8.9+6.8)*5=15.7x5=15x5+0.7x5=75+3.5=78.5

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