Question

Answer 1

giúp mik nha ;^;

Answer 2

Bài 2.5
a: x-36=139

nên x=175

b: 6x-45=9

nên 6x=54

hay x=9

Answer 3

\(2.7\\ a,\Rightarrow2^x-5+74=707:\left(16-9\right)=101\\ \Rightarrow2^x=101-69=32=2^5\\ \Rightarrow x=5\\ b,\Rightarrow4^{x-1}=65-1=64=4^3\\ \Rightarrow x-1=3\Rightarrow x=4\\ c,\Rightarrow2x-3=1\Rightarrow x=2\\ d,\Rightarrow4^{5-x}=4^2\\ \Rightarrow5-x=2\Rightarrow x=3\\ e,\Rightarrow3^{x-3}=3^2\cdot2+3^2=3^2\cdot3=3^3\\ \Rightarrow x-3=3\Rightarrow x=6\\ f,\Rightarrow\left(2x+1\right)^3=3^3\\ \Rightarrow2x+1=3\Rightarrow x=1\)