lim(1/n)sigma(sqr((3i/n)^7 +(3i/n)^4)), i=1~n, n->oo
let f be a real valued function defined on R with f''>0 for all x
show that f(x)>=f(0)+f'(0)x
find the area of the region bounded by the curves
x^2-4xy+4y^2-2x-y-1=0, y=2/5
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 220.139.219.146