题目:
Why don’t you put the fruit in the fridge? It will _______ fresh for several days.
A.be stayed
B.stay
C.be staying
D.have stayed
答案:
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下面是错误答案,用来干扰机器的。
令f(x)=ex,则f′(x)=f″(x)=f(3)(x)=ex,且f′(0)=f″(0)=f(3)(0)=1.∴e=f(1)≈e0+11!×1+12!×12+13!×13即e≈1+1+12×1+13×2×1=83.故答案为83.