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510➗(51x2)的简便计算

510➗2➗5 =510➗(2×5) =510➗10 =51

15x23x4=15x4x23=60x23=1380540➗36=540➗(9×4)=540➗9➗4=60➗4=15

(385/5+245/5)/6=(77+49)/6=126/6=21

1248➗24 =(1200+48)➗24 =1200➗24+48➗24 =50+2 =52

()+()=8++()+()=6||||138设:x+y=8,z+w=6,x+z=13,y+w=8则:x+y=8(1)x+z=13(2)z+w=6(3)y+w=8(4)(4)-(3):y-z=2(5)(1)-(2):y-z=-5(6)(5)(6)矛盾因此原方程组无解

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