10-3(9-y)=(y-4)÷2求Y的值给我答案给悬赏你们的答案让我左右为难

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10-3(9-y)=(y-4)÷2求Y的值给我答案给悬赏你们的答案让我左右为难10-3(9-y)=(y-4)÷2求Y的值给我答案给悬赏你们的答案让我左右为难10-3(9-y)=(y-4)÷2求Y的值给

10-3(9-y)=(y-4)÷2求Y的值给我答案给悬赏你们的答案让我左右为难
10-3(9-y)=(y-4)÷2求Y的值给我答案给悬赏
你们的答案让我左右为难

10-3(9-y)=(y-4)÷2求Y的值给我答案给悬赏你们的答案让我左右为难
10-27+3y=y/2-2
3y-y/2=15
5y/2=15
y=6

(2y+5/3y)²-5y×(5/3y+y)=4 求y的值.(2y+5/3y)的平方-5y×(5/3y+y)=4 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+y)的值 已知7/3*根号(9y)-y-2y*1/y=-2,求y的值 已知4y^2+4y+1+|x-1|=0 求[(x-2y)^2-(2x+y)(2x-y)+(3x-y)(x+y)]÷(2y)的值 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y的值我是这样做的,老师说不对:[(x²+y²)-(x-y)²+2y(x-y)]/4y=(x²+y²-x²+2xy-y²+2xy-2y²)/4y=(4xy-2y²)/4y=[2y(2x-y)]/4y=二分 已知:【(x²+y²)-(x-y)²+2y(x-y)】÷4y=,求4x/(4²-y²)-1/(2x+y)的值已知:【(x²+y²)-(x-y)²+2y(x-y)】÷4y=1,求4x/(4²-y²)-1/(2x+y)的值 已知;2y-x= —3,求 [4y(2x - y) - 2x(2x - y)]÷(2x-y)的值. 已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.(过程完整) 已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值必须在今天之内 RT,若(√2x-y)+y^2+4y+4=0,求[(x-y)^2+(x+y)(x-y)]÷2x的值 已知2x+y=4,求代数式[(x+y)²-(x-y)²-2y(x-1/2y)]÷4y的值 (还没学因式分解) 已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值 已知x^2+9y^2-2x-6y+2=0,求{-(xy/(x-y)^2}^4*(y^2-xy/x)^3*x^4/y^10/(x/xy-y^2)^5的值 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 对于(y一撇)y`=y/x(y-1)求导,我求的结果是y``=-y^2-y`x+y/x^2(y-1)^2 怎么不对啊,我的求导过程是:y`x(y-1) - [x(y-1)]` y y`xy-y`x-(y-1+xy`)y -y^2-y`x+yy``=-------------------------=----------------------=-----------------x^2 (y-1 已知x-y=1(y不为0)求[(x+2y)的平方+(2x+y)(x-4y)-3(x+y)(x-y)]/y的值急吖, 求y''+2y'+y=e^-x/x的通解y''+2y'+y=(e^-x)/x