采纳一下
y-(y+1)/2=2-(y+2)/510y-5(y+1)=20-2(y+2)10y-5y-5=20-2y-45y+2y=16+57y=21y=3(4x-1.5)/0.5-(5x-0.8)/0.2=(1.2-x)/0.1+3(40x-15)/5-(50x-8)/2=(12-10x)+32(40x-15)-5(50x-8)=10(12-10x)+3080x-30-250x+40=120-100x+30-170x+100x=150-10-70x=140x=-2