Question

Giải nhanh giúp e bài 9 nha mn

Answer 1

Bài 9:

a: \(\Leftrightarrow9\left(x+4\right)=5\cdot22+25=135\)

=>x+4=15

hay x=11

b: \(\Leftrightarrow4\left(x^2-4\right)=49-1=48\)

\(\Leftrightarrow x^2-4=12\)

=>x²=16

=>x=4 hoặc x=-4

c: \(\Leftrightarrow6x=39-9=30\)

=>x=5

d: \(\Leftrightarrow x+36=16\cdot3=48\)

=>x=12

e: \(\Leftrightarrow x-2=4\)

hay x=6

f: \(\Leftrightarrow\left[{}\begin{matrix}2x+1=3\\2x+1=-3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-2\end{matrix}\right.\)