(2n+1)3 =27
hay (2n+1)3 =33
=>2n+1=3
2n =2
n=1
ý nhầm:
(2n+1)3=27
(2n+1)3=33
=>2n+1=3
2n=3-1
2n=2
n=2:2
n=1
chung to phan so toi gian voi n thuoc N
a,A=n+1/2n+3
b,B=2x+1/x-3
cac ban giup minh voi
nang 3 nam toi ko bo ban. Mua 1 ngay sao ban bo toi. La gi giup minh voi
chung to phan so toi gian voi n thuoc n a , n+1/2n+3 b, 2n +3 /4n +8
Tim n de phan so sau toi gian voi n thuoc N 2n+3/4n+1
2/5x1/X+1/Xx2+2/5=1/2
giup toi voi ak
cac ban giup toi cau nay voi:
Thuc hien phep tinh(hop ly neu co the):
(10/99+11/199-12/299)x(1/2-1/3+-1/6)
mong cac ban giup minh nhanh voi a. Minh xin cam on
cac phan so \(\frac{n+1}{2n+3}\)va\(\frac{2n+1}{2n+3}\)la cac phan so toi gian voi moi so nguyen n khac -1
tinh:1+3+5+7+...+n=36
HAY GIUP TOI VOI LAM ON ! LAM ON HAY TIM CACH NHANH NHAT . CAM ON CAC BAN , TOI DOI ON CAC BAN SUOT DOI
Chung minh rang phan so sau toi gian voi moi n thuoc N 2n+1/2n(n+1)
