Question

Bài 4 đc hong

Answer 1

a) \(3x-7=2^3\Rightarrow3x-7=8\Rightarrow3x=15\Rightarrow x=5\)

b) \(5x+27=27\Rightarrow5x=0\Rightarrow x=0\)

c) \(40+\left(2x-3\right)=43\Rightarrow2x-3=3\Rightarrow2x=6\Rightarrow x=3\)

d) \(x:12=5\Rightarrow x=5.12=60\)

e) \(90-2\left(3x+1\right)=7.10\Rightarrow2\left(3x+1\right)=90-70\)

\(\Rightarrow2\left(3x+1\right)=20\Rightarrow3x+1=10\Rightarrow3x=9\Rightarrow x=3\)

f) \(3.2^x-15=3^2\Rightarrow3.2^x=9+15\Rightarrow3.2^x=24\Rightarrow2^x=8\)

\(\Rightarrow2^x=2^3\Rightarrow x=3\)