化简:5(y-2)^2-3(y+1)(y-1);(3a+2b)(2b-3a)(9a^2-4b^2)过程仔细一点

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 y (3y^2+8y-3)-6y(3y+2y-1)+9y 3（Y+1）^2-5(Y+1)(Y-1)+2(Y-1)^2,化简 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 5y∧2-(y-2)(3y+1)-2(y+1)(y-5) 解方程3y^2-(2y+1)(y-2)=(y-5)(y-1) 2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-1 解方程：3y^2-(2y+1)(y-1)=(y-5)(y+1) 解方程：3y²-(2y+1)(y-2)=(y-5)(y+1) 已知5(y+1)-3y>2(2y+3)+4化简|2y-1|-|1+2y|. 化简:5(x-y)+2(x+y)-3(x-y) y-(y-1)/2=1-(2y-3)/5 y-y-1/2=3-y+2/5 解方程y-[3y-1]等于5【y+2] 通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9 计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)