7x+5y=12,6x-5y=14,解方程组
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组:一,x-y=3 3x-8y=14 二,x+y=5/6 y+z=7/12 z+x=3
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
1/2x-2y=-74,x-6y=-12解方程组,x/5-y/2=2,2x+3y=4解方程组
解方程组 x+y+z=-7 x-y=12 x+y-z=6
阅读下面方程组的解法:解方程组{x/5=y/7,x+y=-36
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]=2
解方程组4x+7y=22,5x+2y=14
解方程组 4x-2y=14 5x+y=7