1/2(3y-1)-1/5y＜y+1急!

1/2(3y-1)-1/5y＜y+1急! y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 急,看不懂问我(y+3)^2/8-y=(y+3)/4-(y-1)/2 y (3y^2+8y-3)-6y(3y+2y-1)+9y y方+y分之y+3-1-y分之1=y分之4很急, 1/(x+y)-1/(x-y)=-3/20,2/(x+y)+3/(y-x)=-(1/5)急啊! 解方程：3y^2-(2y+1)(y-1)=(y-5)(y+1) 5y∧2-(y-2)(3y+1)-2(y+1)(y-5) 2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-1 解方程3y^2-(2y+1)(y-2)=(y-5)(y-1) 解方程：3y²-(2y+1)(y-2)=(y-5)(y+1) 通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9 先化简,再求值(x+2y)∧2-(x+y)(3x-y)-5y∧2,其中x+-2,y=1/2过程写不写无所谓!急 先化简,再求值(x+2y)∧2-(x+y)(3x-y)-5y∧2,其中x+-2,y=1/2急 y-(y-1)/2=1-(2y-3)/5 y-y-1/2=3-y+2/5