Bài 1: Tính
A= $\frac{1}{1x2}$ + $\frac{1}{2x3}$ + $\frac{1}{3x4}$ +...+ $\frac{1}{49x50}$
Bài 2: TÌm x
a, /x/ - $\frac{3}{4}$ = $\frac{5}{3}$
b, /2x - $\frac{1}{3}$ / + $\frac{5}{6}$ = 1
c, $\frac{2}{3}$x - $\frac{3}{2}$x = $\frac{5}{12}$
d, ( x + $\frac{1}{5}$ ) ² +$\frac{17}{25}$ = $\frac{26}{25}$