`1/51 > 1/100`.
`1/52 > 1/100`.
`...`
`1/100 = 1/100`.
`=> 1/51 + 1/52 + ... + 1/100 > 1/100 + 1/100 + ... + 1/100 ( 50` lần `) = 1/2 = 6/12 < 7/12`.
`=> VT < VP.`
`1/51 > 1/100`.
`1/52 > 1/100`.
`...`
`1/100 = 1/100`.
`=> 1/51 + 1/52 + ... + 1/100 > 1/100 + 1/100 + ... + 1/100 ( 50` lần `) = 1/2 = 6/12 < 7/12`.
`=> VT < VP.`
Bài 1:So Sánh(nhanh nhất)
\(\dfrac{-13}{38}va\dfrac{29}{-88},\dfrac{-18}{31}va\dfrac{-1818}{3131}\)
Bài 2:Tính
a)\(\dfrac{-1}{39}+\dfrac{-1}{52}\)
b)\(\dfrac{-6}{9}+\dfrac{-12}{16}\)
So sánh \(A\) với \(\dfrac{3}{4}\), biết \(A=\dfrac{1}{2^2}+\dfrac{1}{3^2}+\dfrac{1}{4^2}+...+\dfrac{1}{100^2}\)
\(B=\left(1-\dfrac{1}{4}\right)\left(1-\dfrac{1}{9}\right)\left(1-\dfrac{1}{16}\right)....\left(1-\dfrac{1}{81}\right)\left(1-\dfrac{1}{100}\right)\)
So sánh B với \(\dfrac{11}{21}\)
So sánh A=\(\dfrac{1}{100}+\dfrac{1}{101}+\dfrac{1}{102}+..+\dfrac{1}{2021}\)và B=20. So sánh A và B
So sánh tổng S với 251
S = \(\dfrac{1}{2}-\dfrac{1}{3.7}-\dfrac{1}{7.11}-\dfrac{1}{11.15}-\dfrac{1}{15.19}-\dfrac{1}{19.23}-\dfrac{1}{23.27}\)
Mai mk thi r cho mình xem cách làm bài này nhé. Giúp mình với. HELP ME !!!
Tính: \(B=\left(1-\dfrac{1}{2^2}\right).\left(1-\dfrac{1}{3^2}\right).\left(1-\dfrac{1}{4^2}\right)...\left(1-\dfrac{1}{100^2}\right)\) rồi so sánh với \(\dfrac{1}{2}\)
Cho \(A=\left(\dfrac{1}{4}-1\right).\left(\dfrac{1}{9}-1\right)...\left(\dfrac{1}{100}-1\right)\)
So sánh \(A\) với \(\dfrac{-11}{21}\)
Giải chi tiết dùm mik nha. Thankss
So sánh bt: \(M=\dfrac{100^{100}+1}{100^{99}+1};N=\dfrac{100^{101}+1}{100^{100}+1}\)
cho A =(\(\dfrac{1}{2^2}+\dfrac{1}{4^2}+\dfrac{1}{6^2}+...+\dfrac{1}{2024^2}\))
So sánh A với \(\dfrac{1}{2}\)
B=\(\dfrac{1}{11}\)+\(\dfrac{1}{11^2}\)+\(\dfrac{1}{11^3}\)+...+\(\dfrac{1}{11^{99}}\)+\(\dfrac{1}{11^{100}}\)
so sanh B với \(\dfrac{1}{10}\)