150 - [ 120 - ( 7 - 2² )]

= 150 - [ 120 - ( 7 - 4 )]

= 150 - ( 120 - 3 )

= 150 - 117

= 33

150-[120-(7-\(2^2\))]

=150-[120-(7-4)]

=150-(120-3)

=150-117

=33

nha

150 - [ 120 - ( 7 - 2² ) ]

=  150 -  [ 120 - ( 7 - 4 ) ]

= 150 -  ( 120 - 3 )

=  150 -  117

= 33

150-[120-(7-2²)

 = 150 - [120 - ( 7 - 4 ) ]

= 150 - [120 - 3 ]

= 150 - 117

= 33

ok mình choi liên quân nè

ok bn và.......................báo cáo 

\(139,\)

a)Ta có

\(56=2^3.7\)

\(140=2^2.5.7\)

\(\Rightarrow UCLN\left(56,140\right)=2^2.7=28\)

b) Ta có :

\(24=2^3.3\)

\(84=2^2.3.7\)

\(180=2^2.5.3^2\)

\(\Rightarrow UCLN\left(24,84,180\right)=2^2.3=12\)

c)Ta có

\(60=2^2.3.5\)

\(180=2^2.5.3^2\)

\(\Rightarrow UCLN\left(60,180\right)=2^2.3.5=60\)

d) Ta có :

\(15=3.5\)

\(19=19\)

\(\Rightarrow UCLN\left(15,19\right)=1\)

#Rảnh

\(140,\)

a) Ta có :

\(16=2^4\)

\(80=2^4.5\)

\(176=2^4.11\)

\(\Rightarrow UCLN\left(16,80,176\right)=2^4=16\)

b) Ta có:

\(18=2.3^2\)

\(30=2.3.5\)

\(77=7.11\)

\(\Rightarrow UCLN\left(18,30,77\right)=2.3=6\)

#Rảnh

trời ơi

3¹ + 3² + 3³ + .... + 3¹⁰⁰

Đặt :

A = 3¹ + 3² + 3³ + .... + 3¹⁰⁰ 

3A = 3² + 3³ + 3⁴ + ..... + 3¹⁰¹

3A - A = ( 3² + 3³ + 3⁴ + ..... + 3¹⁰¹ ) - ( 3¹ + 3² + 3³ + .... + 3¹⁰⁰ )

2A = 3³⁰¹ - 3¹

A = \(\frac{3^{301}-3}{2}\)