6y^2+9y+2
1.5y+8y-6y=2y-3
(y-2)(y的2次幂-6y-9)-y(y的2次幂-2y-15),其中y=-2
先化简,在求值:6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y=
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
化简:x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y
计算[1]y+2分之y的平方-6y+9除以[3-y] [2] x的立方分之x的平方y乘以[-y分之1]
已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y
啊啊啊啊!做题代数式9-6y-4y*y=7,则2y*y+3y+7的值是( )
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解
计算:(x-y)^2*(y-x)^2*(x-y)^6
6(x+y)2-2(x-y)(x+y)因式分解
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=