{x—2=3y 2x=3y求学霸帮解.

{x—2=3y 2x=3y求学霸帮解. {x＋y＋z＝7 {x＋2y=4 {z=3x－2y 解方程组,求学霸帮忙{x＋y＋z＝7{x＋2y=4{z=3x－2y解方程组,求学霸帮忙 下面都是求微分方程的通解：1、(y^-2xy)dx+x^2dy=0 2、(x^2+y^2)dy/dx=2xy 3、xy’-y=xtan(x/y)4、xy’-y=(x+y)ln[(x+y)/x] 5、xy’=√(x^2-y^2) +y新手求学,请大哥大姐们指点下~ Y＝2x-3+根号下13-4 x的值域 求学霸解答 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 求学霸设计一个函数式,当x=2时,y=2539 {(x+2)^2-(y-3)^2=(x+y)(x-y) {x-3y=2 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2