已知(x²+y²-3)(x²+y²+1)=12,求x²+y²
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
x(x-y)-y(y-x)+(x-y)²因式分解
已知(x+y)²=3(x-y)²=1求x²+y²的值
已知根号X+Y-3+(X-2Y)²=0,求3X+2Y的值
已知(x+y)²与|½y-1|互为相反数,求x³y²的值
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
已知x-y=负三分之二,求(x²+y²)²-4xy(x²+y²)+4x
已知(x²+y²)(1-x²-y²)+6=0,求x²+y²的
1、已知实数x、x满足x²+y²-xy+2x-y+1=0,试求x、y的值.
已知(2x-1)²+|4x-y|=0,求x+y的值
已知:‖2x+3y+5‖+(3x+2y-25)²=0,求x,y的值·
已知有理数x,y,z,且|x-3|+2|y+1|+(2z+1)²=0,求x+y+z的相反数的倒数.