6x-5y=-2 5x+6y=-22

x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3x+5y-(x+y)=6 2(x+y)-3x=-7 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 （5x-6y)(x+y)=0(x不等于y),则y/x= 把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²= {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 x+2y=5x-6y=11 5x+y=6 2x-y=1 2x^+xy-y^-4x+5y-6=? 把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方= 4x-2y-6y*-y-3x+5y* *=2 就是平方 x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2 (计算方程组x+y)/2=6-(x-y)/3,6(x+y)-5(x-y)=18 已知:2x-y/x+y=1/5,求2x+5y/6x-2y的值 3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2 若5x+3y=3x+4y=x+2y+6,则x+y=___