(y^2+2y)^2-7(y^2+2y)-8
1.5y+8y-6y=2y-3
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=
解不等式:5y(8-y)-3y(5-3y)+2y(7-2y)>-39
2y''+y'-y=0
约分y^2+y-2/y^2+4y+4
不定积分 (sin1/y)/ y^2
(y^2+2y)^2-7(y^2+2y)-8
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
y-7-8y=2y-3-5y 咋写?
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8