Tìm x biết: \(\left(\frac{1}{1.101}+\frac{1}{2.102}+...+\frac{1}{10.110}\right).x=\frac{1}{1.11}+\frac{1}{2.12}+...+\frac{1}{100.110}\)
Tìm x
:\(\left(\frac{2011}{1.11}+\frac{2011}{2.12}+...+\frac{2011}{100.110}\right)=\frac{2012}{1.101}+\frac{2012}{2.102}+...+\frac{2012}{10.110}\)
( 1 / 1.101 + 1 / 2.102 + 1 / 3.103 + ... + 1 / 10.110 ) . x = 1 / 1.11 + 1 / 2.12 + ... + 1 / 100 . 110
tìm x biết ( \(\frac{1}{1.101}\)+ \(\frac{1}{2.102}\)+\(\frac{1}{3.103}\)+......+ \(\frac{1}{10.110}\)) .x =\(\frac{1}{1.11}\)+\(\frac{1}{2.12}\)+.......+\(\frac{1}{100.110}\)
(\(\frac{1}{1.101}+\frac{1}{2.102}+...+\frac{1}{10.100}\)).x=\(\frac{1}{1.12}+\frac{1}{2.12}+...+\frac{1}{100.110}\)
Tìm x bt :
\(\left(\frac{1}{1\cdot101}+\frac{1}{2.102}+....+\frac{1}{10\cdot110}\right)\cdot x=\frac{1}{1.11}+\frac{1}{2\cdot12}+...+\frac{1}{100\cdot110}\)
cho : \(A=\frac{1}{1.51}+\frac{1}{2.52}+\frac{1}{3.53}+...+\frac{1}{10.60}\)và \(B=\frac{1}{1.11}+\frac{1}{2.12}+\frac{1}{3.13}+...+\frac{1}{50.60}\)
tính \(\frac{B}{A}\)
Tìm x nguyên biết ( x ^ 2 -1 ) ( x ^ 1 - 4 ) ( x ^ 1 -7 ) ( x ^ 1 -10 ) < 0