数学几问

cpcjustin

Q10. the right answer is really D. very sure!

the MM upstair 思路不对,这儿不是代数等式变换,不可以逆着算!It means

f(t)=t+2,whent=-1,f(-1)=1,f(1)=1+2=3,f(3)=5

now got it?