一个算法 解决马上给分 急的很哦

maxz=108*x1+147*x2+230*x3+190*x4+288*x5+520*x6+492*x7+528*x8+552*x9约束条件：
1:x1+x2+x3<=60000 
2:x4+x5+x6<=80000
3:x7+x8+x9<=30000
4:0.152x1+0.17x2+0.185x3+0.32x4+0.41x5+0.54x6+0.6x7+0.745x8+0.86x9<=8000*5
5:x3<=10000
6:x6<=6000
7:0.03*1*(x1+x2+x3)+0.03*1.2*(x4+x5+x6)+0.08*1.5*(x7+x8+x9)<=3000
8:0.03*0.152x1+0.03*0.17x2+0.03*0.185x3+0.03*0.32x4+0.03*0.41x5+0.03*0.54x6+0.08*0.6x7+0.08*0.745x8+0.08*0.86x9<=2600
9:x1>=20000
x4>=40000
x8>=300
x9>=400 当maxz最大的时候x1,x2,x3,x4,x5,x6,x7,x8,x9的值分别是多少 怎么做啊  急啊.....求算法