{(x/3)-(y/4)==3, (x/2)+(y/3)==13} 得 {x=18, y=12}
{x-(y-1/2)==3, 2(x-y)+3(2y-x)==-6} 得 {x=4/3, y=-7/6}
{(2x-1/5)+(3y-2/4)==2, (3x+1/5)-(3y+2/4)==0} 得 {x=3/5, y=1/2}
{3(x-1)==y+5, 5(y-1)==3(x+5)} 得 {x=5, y=7}
{(2u/3)+(3u/4)==(1/2), (4u/5)+(5u/6)==(7/12)} 无解
PS:应是{(2u/3)+(3v/4)==(1/2), (4u/5)+(5v/6)==(7/12)}吧
解得{u=15/32, v=1/4}
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降级处理,