根据拼音写汉字。
yuănfāng____ dătīng ____ chànggē____ liánmáng ____
先简化、再求值:(x+2y)2﹣(x+y)(3x﹣y)﹣5y2÷2x,其中x=﹣2,y= 12 .
____
— Why do you look sad?
— There are so many problems _____.