Question

 

Minh cần rất gấp 

Mình cmr ơn ạ

Answer 1

Bài 3:

a) \(2\cdot5^2+3:71^0-54:3^3\)

\(=2\cdot25+3:1-54:27\)

\(=50+3-2\)

\(=50+1\)

\(=51\)

b) \(150+50:5-2\cdot3^2\)

\(=150+10-2\cdot9\)

\(=160-18\)

\(=142\)

Answer 2

2:

c: \(30=2\cdot3\cdot5;48=2^4\cdot3\)

=>\(ƯCLN\left(30;48\right)=2\cdot3=6\)

=>\(x\inƯ\left(6\right)\)

=>\(x\in\left\{1;-1;2;-2;3;-3;6;-6\right\}\)

d: \(25=5^2;80=2^4\cdot5\)

=>\(ƯCLN\left(25;80\right)=5\)

\(x\inƯC\left(25;80\right)\)

=>\(x\inƯ\left(5\right)\)

=>\(x\in\left\{1;-1;5;-5\right\}\)

e: \(36=2^2\cdot3^2;18=3^2\cdot2\)

=>\(ƯCLN\left(36;18\right)=2\cdot3^2=18\)

=>x=18

f: \(49=7^2;84=2^2\cdot3\cdot7\)

=>\(ƯCLN\left(49;84\right)=7\)

=>x=7