x=3.6,y=1/4 5x+4y=5*3.6+4*(1/4)
=18+1
=19
(1/3)x+(1/2)y=(1/3)*3.6+(1/2)*(1/4)
=1.2+1/8
=1.325
不知道对不对,你自己再算一遍