1.求((√5-1)^2 / (√2+1)(√3+1)) + (√2(√5+√2)^2 / (1+√2)(√3-√2))
+ (√3(√5+√3)^2 / (1+√3)(√2-√3)) = _______
ANS: 1-√2-√3-2√5
2.degf(x)=5 , f(k)=k^7 , k=1,2,3,4,5,6 ,求f(7)-7^7 = _______
ANS: -20160
3. (3-sinx)/(2+cosx) , 求max=_____ , min=_____
ANS: max=9/8 min=-2
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