方程组 x+5y+2=06x-7y=16x=y=
方程组 x+5y+2=06x-7y=16x=y=
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
方程组x-2y=8,3x-4y=5,x=?,y=?
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
已知方程组3x-5y=16和2x+7y..
已知方程组{2x+y=7,x+2y=8,则x-y=(),x+y=().
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1
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