Question

Mình cần gấp ạ 

Mình cảm ơn nhieeif ạ !!!

Answer 1

a) \(7^2-7\left(13-x\right)=14\)

\(7\left(13-x\right)=49-14=35\)

\(13-x=5\)

\(x=13-5=8\)

b) \(5x-5^2=10\)

\(5x=10+25=35\)

\(x=7\)

c) \(4\left(x-5\right)-2^3=2^4.3=48\)

\(4\left(x-5\right)=48+8=56\)

\(x-5=14\)

\(x=19\)

Answer 2

4:

a: \(\Leftrightarrow49+7\left(x-13\right)=14\)

=>7(x-13)=35

=>x-13=5

=>x=18

b: \(5x-5^2=10\)

=>\(5x=10+25=35\)

=>x=7

c: \(4\left(x-5\right)-2^3=2^4\cdot3\)

=>\(4\left(x-5\right)=16\cdot3+8=56\)

=>x-5=14

=>x=19