已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是

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已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是5(x-3y)

已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是
已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是

已知-x+3y=5,则5(x-3y)的平方-x+3y-5的值是
5(x-3y)的平方-x+3y-5
=5*(-5)²+5-5
=125

5(x-3y)^2-x+3y-5
=5[-(-x+3y)]^2+(-x+3y)-5
=5[-5]^2+5-5
=5×5^2
=5×25
=125