用代入法解方程组:2x-3y-2=0 (2x-3y+5)÷7+2y=9 急
用代入法解方程组:2x-3y-2=0 (2x-3y+5)÷7+2y=9 急
用代入法解方程组5x+3y=36,-x+9y=2
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}
{3x+2y=8,x-2y=0用代入法解方程组
{2x+5y=-2,x=8-3y用代入法解方程组
用代入法解方程组3x-2y=1① 2x+3y=5② 急
用代入法解方程组:2x+3y=-1 4x-y=5
用代入法解方程组:3x-5y=-9,2x+7y=-6
用代入法解下列方程组(1)y=2/3x 2x+8y=22 (2)x-y=-3 7x+5y=0 (3)x+3y=2 9x-
用代入法解方程组:2x=3y 3x=2y+1
用代入法解方程组 2x+3y=12 x-2y=-1