Ifyouwanttofindadecentlocationforyourownhome,________Mr.Smithforadvice.
Sixtypercentoftelevisionviewerschosehimastheir_______actor.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
求函數f(x,y)=x^2+y^2在條件2x+3y=1下的極值.
新民主主義社會在經濟和政治上都居于領導地位的是_________。
