用代入法解方程组 {3x-4y=-12 {y-3x=9
用代入法解方程组 {3x-4y=-12 {y-3x=9
用代入法解方程组2x+3y=12,3x-4y=17代入法代入法代入法!
用代入法解方程组:y=3(x-y),x=2(x-y)
用代入法解方程组3x+2y=4x+3y=1
用代入法解方程组5x+3y=36,-x+9y=2
用代入法解方程组 2x+3y=12 x-2y=-1
用代入法解方程组4x-3y=10,2x-y=8
用代入法解方程组:2x+3y=-1 4x-y=5
用代入法解方程组 {x-y=3 2y+3(x-y)=11}
用代入法解二元一次方程组{3X+2Y=9 4X-5Y=19}
用代入法解方程组,x等于4-5y,3x-9y等于4
用代入法解方程组:2x=3y 3x=2y+1