Bài 14: Tìm x:
a) x - $\frac{3}{4}$ = $\frac{1}{7}$
b) (-x+ $\frac{3}{5}$ )+ $\frac{13}{20}$ = $\frac{5}{6}$
c) |x- $\frac{4}{3}$ |- $\frac{1}{3}$ = $\frac{1}{2}$
d) $\frac{8}{3}$ - | $\frac{7}{9}$ -x| = $\frac{-1}{5}$
e) (x- $\frac{1}{4}$ $)^{2}$ - $\frac{25}{64}$ = 0
f) (x- $\frac{1}{4}$ $)^{2}$+ $\frac{17}{64}$ = $\frac{21}{32}$
g) $\frac{2}{5}$ .x + $\frac{1}{3}$ = $\frac{1}{5}$
h) $\frac{4}{9}$ - $\frac{5}{3}$ .x= -2
i) $\frac{5}{7}$ : x-3= $\frac{-2}{7}$
Bài 15: Tính A= $\frac{3}{1.3}$ + $\frac{3}{3.5}$+ $\frac{3}{5.7}$+...+ $\frac{3}{199.201}$
B= $\frac{5}{1.3}$ + $\frac{5}{3.5}$+ $\frac{5}{5.7}+...+ + $\frac{5{201.203}$
Loga
Sinh Học lớp 12
