cho A = 4 / 15.19+ 4/ 19.23 +.......+ 4/ 399.403 .chứng minh 16/81 < A < 16/80
cho A = 4 / 15.19+ 4/ 19.23 +.......+ 4/ 399.403 .chứng minh 16/81 < A < 16/80
Cho A= 4/15.19+4/19.23+...+4/399.403 chứng minh 16/81<A<16/80
Cho A = 4/15.19 + 4/19.23 + .....+ 4/399.403 chứng minh 16/81 < A < 16/80
cho A = 4 / 15.19+ 4/ 19.23 +.......+ 4/ 399.403 .chứng minh 16/81 < A < 16/80
\(Cho:A=\frac{4}{15.19}+\frac{4}{19.23}+...+\frac{4}{399.403}\)
Chứng minh: \(\frac{16}{81}\)< A< \(\frac{16}{80}\)
Cho \(A=\frac{4}{15.19}+\frac{4}{19.23}+...+\frac{4}{399.403}.\) Chứng minh răng: \(\frac{16}{81}< A< \frac{16}{80}\)
a. A = 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6
b. B = 3/2.5 + 3/5.8 + 3/8.11 + 3/11.14
c. 4/3.7 + 4/7.11 + 4/11.15 + 4/15.19 + 4/19.23 + 4/23.27
d. 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 +...+ 1/110
e. 1/10 + 1/40 + 1/88 + 1/154 + 1/138 + 1/340
Ai giúp mik với
mik cần gấp
Ai nhanh mik tick cho
\(\frac{4}{3.7}+\frac{4}{7.11}+\frac{4}{11.15}+\frac{4}{15.19}+\frac{4}{19.23}+\frac{4}{23.27}\)