m(x-y)平方-x+y

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m(x-y)平方-x+ym(x-y)平方-x+ym(x-y)平方-x+ym(x-y)平方-x+y=(mx-my)(x-y)-(x-y)=(mx-my-1)(x-y)

m(x-y)平方-x+y
m(x-y)平方-x+y

m(x-y)平方-x+y
m(x-y)平方-x+y
=(mx-my)(x-y)-(x-y)
=(mx-my-1)(x-y)