1.tìm x
a) 7\(^{\left(x-2\right).\left(2x+3\right)}\)= 1
b)9\(^{x+1}\)- 5 . 3\(^{2x}\)= 324
c) /x-1/ - \(\frac{1}{4}\)= \(\frac{5}{2}\)
2.Tính
(1 - \(\frac{1}{4}\))(1-\(\frac{1}{9}\))(1-\(\frac{1}{16}\))....( 1 - \(\frac{1}{81}\))(1-\(\frac{1}{100}\))