\(A=\frac{2^{18}-3}{2^{20}-3}=1-\frac{2^2}{2^{20}-3}\)
\(B=\frac{2^{20}-3}{2^{22}-3}=1-\frac{2^2}{2^{22}-3}\)
Vì \(\frac{2^2}{2^{20}-3}>\frac{2^2}{2^{22}-3}\) nên A < B
\(A=\frac{2^{18}-3}{2^{20}-3}=1-\frac{2^2}{2^{20}-3}\)
\(B=\frac{2^{20}-3}{2^{22}-3}=1-\frac{2^2}{2^{22}-3}\)
Vì \(\frac{2^2}{2^{20}-3}>\frac{2^2}{2^{22}-3}\) nên A < B
Bài 1: So sánh lũy thừa
a) 125^80 và 25^125
b) 31^11 và 17^14
c) \(A=\frac{19^{30}+5}{19^{31}+5}vàB=\frac{19^{31+5}}{19^{32}+5}\)
d)\(A=\frac{2^{18}-3}{2^{20}-3}vàB=\frac{2^{20-3}}{2^{22}-3}\)
e) \(A=\frac{1+5+5^2+...+5^9}{1+5+5^2+...+5^8}vàB=\frac{1+3+3^2+...+3^9}{1+3+3^2+...+3^8}\)
Bài 2: Cho \(A=1+2+2^2+...+2^{30}\)
Viết A+1 dưới dạng lũy thừa
so sank
\(A=\frac{2^{18}-3}{2^{20}-2}vaB=\frac{2^{20}-3}{2^{22}-3}\)
so sánh
A=\(\frac{2^{18-3}}{2^{20}-3}\)và B= \(\frac{2^{20}-3}{2^{22}-3}\)
so sánh
a) \(A=\frac{2^{18}-3}{2^{20}-3}\) và \(A=\frac{2^{20}-3}{2^{22}-3}\)
cho A=\(\frac{2^{18}-3}{2^{20}-3}\)
B=\(\frac{2^{20}-3}{2^{22}-3}\)
so sanh a va b nha
ai giai nhanh tui cho 5 k
so sánh \(y=\frac{2^{18}-3}{2^{20}-3}\)và \(y=\frac{2^{20}-3}{2^{22}-3}\)
cho A=\(\frac{2^{18}-3}{2^{20}-3}\)
B=\(\frac{2^{20}-3}{2^{22}-3}\)
so sanh A và B nha
ai giải nhanh tui cho 5 k nha
Rút gọn:
A =\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{20}\right)\)
B = \(1+\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{2012}}\)
So sánh :
\(A=\frac{20^{10}+1}{20^{10}-1}vàB=\frac{20^{10}-1}{20^{10}-3}\)
So sánh:
a)A=\(\frac{19^{30}+5}{19^{31}+5}\):B=\(\frac{19^{31}+5}{19^{32}+5}\)
b)A=\(\frac{2^{18}-3}{2^{20}-3}\):B=\(\frac{2^{20}-3}{2^{22}-3}\)
Lưu ý :Ko tính kết quả chỉ so sánh
Thankyouverymuch