若m^2+n^2-n+4m+17/4=0,m=____,n=_____计算:(1)(2x-3y)^2-(3x+y)(3x-y)(2)(x+y)(x^2+y^2)(x-y)(3)(m-n-3)^2

问题描述:

若m^2+n^2-n+4m+17/4=0,m=____,n=_____
计算:(1)(2x-3y)^2-(3x+y)(3x-y)
(2)(x+y)(x^2+y^2)(x-y)
(3)(m-n-3)^2

m²+n²-n+4m+17/4=0(m+2)²+(n-1/2)²=0m=-2,n=1/2(1)=4x²-12xy+9y²-9x²+y²=-5x²-12xy+10y²(2)=(x²-y²)(x²+y&s...