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2x+3y=12,3x-4y=17代入法代入法代入法!
用代入法解方程组 {3x-4y=-12 {y-3x=9
用代入法解三元一次方程组4x-9z=17,3x+y+15z=18,x+2y+3z=2 代入法!代入!
用代入法解方程组 2x+3y=12 x-2y=-1
用代入法解方程组3x+2y=4x+3y=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:y=3(x-y),x=2(x-y)
用代入法解方程组 {x-y=3 2y+3(x-y)=11}
用代入法解方程组①2X+Y=3 ②Y=5X-4可将②代入①,得一元一次方程【 】.
用代入法解方程组:2x=3y 3x=2y+1
{2x+5y=-2,x=8-3y用代入法解方程组