4x-7y=222① 5x-6y=217② 这个方程怎么解?

变式:已知x,y满足4x+7y=222,5x+6y=217,则x-y=? {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 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= 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= 解下列方程组.｛4x+7y=222 5x+6y=217 初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x 大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快 已知|5x-y-8|+(7y-x+2)=0则4x+6y 7x:4y,x:y=( ):( 5x-4y(y-x)=? ①7x-3y=1,②-5x+6y,方程组①7x-3y=1,②-5x+6y求x,y 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 4x-7y=222① 5x-6y=217② 这个方程怎么解?