Question

Giups mik câu a-b-d với ạ

Answer 1

d: \(\Leftrightarrow\dfrac{x+14}{86}+1+\dfrac{x+15}{85}+1+\dfrac{x+16}{84}+1+\dfrac{x+17}{83}+1+\dfrac{x+116}{4}-4=0\)

=>x+100=0

hay x=-100

a: \(\Leftrightarrow2\left(x+1\right)^2+3\left(x^2-3x+2\right)=\left(3x-1\right)\left(x-4\right)+56\)

\(\Leftrightarrow2x^2+4x+2+3x^2-9x+6-\left(3x^2-13x+4\right)-56=0\)

\(\Leftrightarrow5x^2-5x-48-3x^2+13x-4=0\)

\(\Leftrightarrow2x^2+8x-52=0\)

\(\Leftrightarrow x^2+4x-13=0\)

\(\Leftrightarrow\left(x+2\right)^2=17\)

hay \(x\in\left\{-\sqrt{17}-2;\sqrt{17}-2\right\}\)