z=345.67y-94..09xy=y(345.67-94.09x)因为1.35所以345.67-94.09x>00所以y取最大值，x取最小值，时z最大z=3*（345.67-94.09*1.35）=218.6485
Z=(345.67-94.09x)y345.67-94.09x>0，所以y=3时Z最大y≥0，所以x=1.35时Z最大将x=1.35，y=3代入原式求得Zmax=655.9455
