a) \(\dfrac{x+1}{94}+\dfrac{x+2}{93}+\dfrac{x+3}{92}=\dfrac{x+4}{91}+\dfrac{x+5}{90}+\dfrac{x+6}{89}\)

b) \(\dfrac{29-3}{21}+\dfrac{27-x}{23}+\dfrac{25-x}{25}+\dfrac{23-x}{27}+\dfrac{21-x}{29}=-5\)

c) \(\dfrac{x-5}{100}+\dfrac{x-4}{101}+\dfrac{x-3}{102}=\dfrac{x-100}{5}+\dfrac{x-101}{4}+\dfrac{x-102}{3}\)

d) \(\dfrac{315-x}{101}+\dfrac{313-x}{103}+\dfrac{311-x}{105}+\dfrac{309-x}{107}=-4\)

e) \(\dfrac{x+1}{10}+\dfrac{x+1}{11}+\dfrac{x+1}{12}=\dfrac{x+1}{13}+\dfrac{x+1}{14}\)

f) \(\dfrac{x-10}{30}+\dfrac{x-14}{43}+\dfrac{x-5}{95}+\dfrac{x-148}{8}=0\)

a) \(\left(14^{x-1}\right)^2=196\)

b)\(3^x+3^{x+1}+3^{x+2}=39\)

c) \(\left(3x-7\right)^{2012}=\left(3x-7\right)^{2013}\)

a)\(\dfrac{1}{5}+\sqrt{3x+2}=1\)

b)\(3\sqrt{x+1}-\dfrac{1}{4}=-5\)

c)\(\dfrac{2}{9}-\sqrt{\left(x+1\right)^2}=\dfrac{-23}{9}\)

d)\(\left(\sqrt{2x+1}-4\right)\left(5+\sqrt{x}\right)=0\)

\(5^x\)+\(5^{x+2}\)=650

Bài 1: Cho ΔABC có góc A = \(75^o\). Biết góc góc B trừ góc C = \(25^o\). Tính góc B, C

Bài 2: Cho ΔABC biết góc A trừ góc B = \(18^o\): góc B trừ góc C = \(18^o\). TÍnh góc A, B, C

Bài 3: ΔABC có góc A = \(60^o\): góc C = \(30^o\). Tính góc ngoài của ΔABC tại góc A và B

a) \(\dfrac{1}{5}+\sqrt{3x+2}=1\)

b) \(3\sqrt{x+1}-\dfrac{1}{4}=-5\)

c) \(\dfrac{2}{9}-\sqrt{\left(x+1\right)^2}=\dfrac{-23}{9}\)

d) \(\left(\sqrt{2x+1}-4\right)\left(5+\sqrt{x}\right)=0\)

I. Stress