Question

B = 45a + 79b + 30a – 54b với 3a + b = 2021.

Answer 1

Giup minh voi 

 

Answer 2

`B=45a+79b+30a-54b`

`=75a+25b`

`=25(3a+b)`

`=25.2021`

`=50525`

Answer 3

\(B=45a+79b+30a-54b=75a+25b=25\left(3a+b\right)=25.2021=50525\)

Answer 4

\(B=45a+79b+30a-54b\)

\(B=\left(45a+30a\right)+\left(79b-54b\right)\)

\(B=75a+25b\)

\(B=25\left(3a+b\right)\)

\(B=25.2021\) (vì 3a+b=2021)

Answer 5

B=50525

Answer 6

Cảm ơn nha 

Answer 7

B=45a+79b+30a−54b=75a+25b=25(3a+b)=25.2021=50525

Answer 8

Ta có: \(45a+79b+30a-54b\)

\(=75a+25b\)

\(=25\cdot2021=50525\)