Question

\(\frac{254X399-145}{254+399X253}\)

Answer 1

(253+1)x399-145/254+399x253

=253x399+(399-145)/254+399x253

=253x399+254/254+399x253

=1

Answer 2

Ta có:

\(\frac{254X399-145}{254+399X253}\)

\(=\frac{\left(253+1\right)X399-154}{254+399X253}\)

\(=\frac{253X399+399-154}{254+399X253}\)

\(=\frac{253X399+254}{253X399+254}\)

\(=1\)

Answer 3

bang 1