求解 3x=6y-2 3x-4y=2 6x-3y=-5 4x-9y+1=0 4(2x+y)-5(2x-y)=3 2(2x+y)+10(2x-y)=39注意：此为二元一次方程组

求解方程组3x+4y/2=6x+5y/3=1 二元一次方程求解. x+3y-4=0 2x+6y-9=0 求解(6x^2y^4-x^3y^3)/(-2x^2y^3) 求x+y/3+x-y/2=6 3(x+y)-2(x-y)=28方程组的解{ x+y/3+x-y/2=6{ 3(x+y)-2(x-y)=28求解 用加减法解下列方程组:3(x+y)-4(x-y)=-18 , 2分之(x+y)+6分之(x-y)=2求解啊,急~ 求解Y=3X/(X^2+4)的值域 2x+3y+z=11,x+y+z=6,3x-y-z=-2求解 2x+3y+z=11,3x+y-z=2,x+y+z=6求解 x-y+z=0,2x+y-2z=6,3x-y-z=3求解, (x-3)^2+(y-3)^2=6,求y/x的最小值用柯西不等式求解 2x-y=-6 5x+2y=3方程组的解是多少?求解 二元一次方程组求解 3x+2y=34 12x+6y=74 {2x+3y=3,{4x-y=13.求解下列方程组 {2x+3y=3,{4x-y=13.求解下列方程组 ①：6x+8y=55.8求解 ②：3x+8y=30.3求解 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)