3X=7Y 解得：Y=51,X=170-51=119

3X=7Y 解得：Y=51,X=170-51=119 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 将3x-y=7和2x+y=8组成方程组得，3x-y=72x+y=8，解得， 2(x+y)-3(x-y) =1 6(x+y)+7(x-y)=51大神们帮帮忙 十万分,[3x+2y]/2=[2x+y]/3=[x-y+1]/4 解得. 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 已知(x+y-7)²+|2x-3y-4|=0 求xy得值 若x+7y=y-3x，求x 3X+8Y=51 X+6Y=21 问X=?Y=? 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6