11x-15y=18,2x+3y=9.(x+1)/3=(5x-y)/5,7y=5x+25

11x-15y=18,2x+3y=9.(x+1)/3=(5x-y)/5,7y=5x+25 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 3x-2y=15,3y-2x=11 x= y= 3x-2y=15 3y-2x=11 求x+y 若3x-2y=15,3y-2x=11,求x+y (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 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)=? (x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11 3x-y+x=3 4【X-y-1】=3【1-y】-1 5x-4y+4x=3 2x+y-3x=11 【 x除以2 】-【y 除以3】 =2 2x+7y-3x=19 x+y+x=12 3x+2y-x=18 分式 (11 18:8:17)已知x/y=2,求x·x-x·y+3y·y/x·x+x·y+6y·y的值 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=