解方程组6x+7y=﹣19,5y-6x=﹣17

解方程组6x+7y=﹣19,5y-6x=﹣17 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 如何解方程组 6x+7y=5 6x-7y=19 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组 x+y+z=-7 x-y=12 x+y-z=6 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 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2() 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 用加减法 解方程组 ｛3x+2y=13 3x-2y=5 ｛6x+7y+19=0 6x-5y-17=0 ｛4x-2y=39