解方程组：{x-y=4,3x+4y=19

解方程组：｛4x+5(x-y)=30,4y-3(x-y)=6 解方程组｛ 3x-4y(x-y)=3 { 2x-3y=1 解方程组x+y/3=x-y/4 2x+3y=11 解方程组3x+5(x+y)=2 3y-2(x+y)=4 解方程组,x+y/2=3x-2y=10+6x+y/4, 方程组4=x+y,8=3x-y求x,y的解 3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y) 解方程组;x+y/2=x-y/3=6 4(x+y)-3(x-y)=-20 解二元一次方程组3(x+y)-4(x-y)=4 x+y/2+x-y/6=1 解方程组2(x-y)/3-x+y/4=-1 6(x-y)-4(2x-y)=16 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1kkkkkkkk 3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组 解方程组3(x+y)-4(x-y)=4,x+y除以2+x-y除以6=1 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3（x-y）=15 解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3 解方程组⑴(x+y)/2-(x-y)/3=6,⑵3(x+y)=4(x-y) 解方程组 x-y/3-x+y/4=2 x-y/6-x+y/8=3