y=(3x+6)/(x^2+6x+11)的值域为不是很明白,希望给出过程题目没给定义域..

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 因式分解3x^2(x-y)+6x(y-x) 6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=? x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4) 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y 解方程组：3(x+y)+2(x-y)=11,6(x+y)-5(x-y)=13. 大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快