x5 y7 2021826 xxy yxy xxy yxy x

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x=5 y=7 2021/8/26 x=x+y y=x-y x=x*y y=x/y x= y= z=x x=y y=z

x=5 y=7 2021/8/26 x=x+y y=x-y x=x*y y=x/y x= y= z=x x=y y=z