看图列算式。
总共有几个苹果？
2＋1＝3
若|m+n|+（m﹣2）2=0，则2m+3n的值是____ ．
—I since I was 11. Now I am thinking about picking it up again.
—Good for you!
函数y=xex在其极值点处的切线方程为____ 。
，则∁UP＝( )．