这几个二元一次方程组不会做,①4(x-y-1)=3(1-y) -2 x/2+ y/3=2②2(x-y)/3 - x-y/4=-1 6(x+y)-4(2x-y)=16
问题描述:
这几个二元一次方程组不会做,①4(x-y-1)=3(1-y) -2 x/2+ y/3=2
②2(x-y)/3 - x-y/4=-1 6(x+y)-4(2x-y)=16
答
先化简4(x-y-1)=3(1-y) 得4x-y=7① 再化简-2 x/2+ y/3=2 得-3x+6=9② 结合①②的x=13 y=45 同样化简2(x-y)/3 - x-y/4=-1 得10x-10y=24 ① 化简 6(x+y)-4(2x-y)=16得-2x+10y=16②把①②式相加得x=5...