[6xy-3(xy-1/2x的平方y]/3xy=2-1+x/6=1+x/6=1+2008/6=335又2/3不应该是[6xy-3(xy-1/2x²y]/3xy=（6xy-3xy+3/2x²y)/3xy=2-1+1/2x=1+1/2x 是这样吗？如果不是请帮忙改正，谢谢题目是：{6xy-3【xy-1/（2x²y）】}/3xy=?还是([6xy-3(xy-x²y/2)/3xy=?因为 你的题目不清楚，让人很难猜。第二个，那答案对吗([6xy-3(xy-x²y/2)/3xy=(6xy-3xy+x²y/2)/3xy=3xy-x²y/2)/3xy=1-x/2到这时应该是=(6xy-3xy+x²y/2)/3xy=（3xy+x²y/2）/3xy=1+x/2吧对