已知X²-3X+1=0 求X²+1/X² 若(X-2Y)²+(X+2)²
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知若5x²-3x-5=0,求:(1)5x²-2x-1/(5x²-2x-5);(2)x
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
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
1.已知x=2-根号3,求(x-1分之1-2x+x²) -(x²-x分之根号x²-2x+1
已知实数x满足x²-3x+1=0.求(1)x+ 1/x (2)x²+ 1/x² (3)x-
已知x²-x-1的值是0求x³-x²-x+5和(3x²+5x+2)-(x
已知x²-4x+4+|y+3|=0,求代数式(x-1/2-1)(x-1/2+1)-(x-1/2y-1)