已知2x-y=10,求:中括号(x²+y²)-(x-y)²+2y(x-y)中括号,÷4y的
已知2x-y=10,求:中括号(x²+y²)-(x-y)²+2y(x-y)中括号,÷4y的
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知x²-y²=10,求[(x+y)³-2y(x+y)²-4(x+y)]÷(x+
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)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-y=10,求代数式[x²+y²-(x-y)²+2y(x-y)]÷4y的值
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)