解方程组:x+y=20 (19+y)·2=27+x
解方程组:x+y=20 (19+y)·2=27+x
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27
解方程组 x+2y=1.5,12(x+y)+15y=20
解方程组1/(x-y)-1/(x+y)=3/20,2/(x+y)+3/(x-y)=19/20
解方程组x+y+√(x+y)=20;x²+y²=136
解方程组X+Y/2=3X-2Y=10+6X+Y/4
如果方程组3x+y=k x+3y=2的解x,y
用代入法解方程组:y=3(x-y),x=2(x-y)
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
解方程组:{x+|3x-y|+3y=15 2x+y=6