已知x=6.61,y=-3.39,球(x-y)(x²+3xy+y²)-5xy(x-y)的值

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已知x=6.61,y=-3.39,球(x-y)(x²+3xy+y²)-5xy(x-y)的值

已知x=6.61,y=-3.39,球(x-y)(x²+3xy+y²)-5xy(x-y)的值
已知x=6.61,y=-3.39,球(x-y)(x²+3xy+y²)-5xy(x-y)的值

已知x=6.61,y=-3.39,球(x-y)(x²+3xy+y²)-5xy(x-y)的值
(x-y)(x²+3xy+y²)-5xy(x-y)
=10(x²+3xy+y²)-5xy*10
=10(x^2-2xy+y^2)
=10(x-y)^2
=1000

是(x-y)的三次方,也就是10的三次方,1000