Question

 

Mg giải gấp giúp mình ạ

Answer 1

Bài 4:

a) \(2^x=2^5\)

\(\Rightarrow x=5\)

b) \(\left(-7\right)^x=\left(-7\right)^9\)

\(\Rightarrow x=9\)

c) \(4^x=64\)

\(\Rightarrow4^x=4^3\)

\(\Rightarrow x=3\)

d) \(5^x=625\)

\(\Rightarrow5^x=5^4\)

\(\Rightarrow x=4\)

Answer 2

3:

a: \(-\dfrac{3}{5}-x=-0,75\)

=>\(x=-\dfrac{3}{5}+\dfrac{3}{4}=\dfrac{3}{20}\)

b: \(x+\dfrac{1}{3}=\dfrac{2}{5}-\left(-\dfrac{1}{3}\right)\)

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

=>x=2/5

c: \(-0,15-x=1\dfrac{4}{5}\)

=>\(-0,15-x=1,8\)

=>x=-0,15-1,8=-1,95

d: \(-\dfrac{4}{7}-x=\dfrac{3}{5}\)

=>\(x=-\dfrac{4}{7}-\dfrac{3}{5}\)

=>\(x=\dfrac{-20-21}{35}=-\dfrac{41}{35}\)