已知(x+y-3)²+(x-y+4)²=0,求x²+y²的值
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知(2x-1)²+|4x-y|=0,求x+y的值
已知根号X+Y-3+(X-2Y)²=0,求3X+2Y的值
已知(x+y-3)²+(x-y+4)²=0,求x²+y²的值
初一数学题解答 已知(x+y-3)²+(x-y+4)²=0,求x²-y²的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知:‖2x+3y+5‖+(3x+2y-25)²=0,求x,y的值·
已知-x+2y=5,求5(x-2y)²-3(x-2y)-60的值,
已知(x+y)²与|½y-1|互为相反数,求x³y²的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知|y-x|=x-y,且|x|=3,|y|=4,试求(x+y)的三次方的值?
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)