Question

Tính nhanh:

45 x 16 - 17/ 45 x 15 + 28 

Answer 1

\(\frac{45\times16-17}{45\times15+28}\)

= \(\frac{45\times\left(15+1\right)-17}{45\times15+28}\)

=  \(\frac{45\times15+45-17}{45\times15+28}\)

= \(\frac{45\times15+28}{45\times15+28}\)

= \(1\)

Answer 2

\(\frac{45\times16-17}{45\times15+28}\)

\(=\)\(\frac{45\times\left(15+1\right)-17}{45\times15+28}\)

\(=\)\(\frac{45\times15+45\times1-17}{45\times15+28}\)

\(=\)\(\frac{45\times15+\left(45-17\right)}{45\times15+28}\)

\(=\)\(\frac{45\times15+28}{45\times15+28}\)

\(=1\)