解方程组:①4x+3y-5=0,x-2y-4=0.②5x-2=2(y-1),2(x-2)+(y-1)③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2

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解方程组:①4x+3y-5=0,x-2y-4=0.②5x-2=2(y-1),2(x-2)+(y-1)③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2
解方程组:①4x+3y-5=0,x-2y-4=0.②5x-2=2(y-1),2(x-2)+(y-1)③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2

解方程组:①4x+3y-5=0,x-2y-4=0.②5x-2=2(y-1),2(x-2)+(y-1)③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2
第二题第二个式子未知数关系不完整,没法算

1.x=2 y=-1

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