[x/3=1+y/2 5x-6=5/6+7y

x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 3x+2y/4=2x+y/5=x-y+1/6 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 1 .{5X-2y=3 X+6y=7 2.{5x+4y=-3 2x-3y=8 3.{x+Y+Z=26 x-Y=1 2x- 解二元一次方程{5X-2y=3 X+6y=7 {5x+4y=-3 2x-3y=8 {x+Y+Z=26 x-Y=1 2x- 函数的值域(1)y=3x (2)y=8/x (3)y=-4x+5 (4)y=x^2-6x+7 同志们 ... 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1