4y²-28=0 (x-2)²-9=0 (2x-3)²-16=0
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
(x+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
已知x²-4x-1=0,求代数式(2x-3)²-(x+y)(x-y)-y²的值
已知x²-4x-1=0求代数式(2x-3)²-(x+y)(x-y)-y²的值
如果x²+y²-4x+6y+13=0,那么2x+3y=()
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
若|x+y+4|+(x-y+2)²=0,则3x+2y=( )
已知4x²+y²-4x-6y+10=0,求[(2/3)x√(9x)+y²√(x/y
已知4x²+y²-4x-6y+10=0,求(2/3√9x+y²√x/y³)-(x