\(\frac{254\times399-145}{254+399\times253}=\frac{253\times399+399-145}{254+399\times253}=\frac{253\times399+254}{254+399\times253}=1\)

\(\frac{254.399-145}{254+399.253}\)

\(=\frac{\left(253+1\right).399-145}{254+399.253}\)

\(=\frac{253.399+399-145}{254+399.253}\)

\(=\frac{253.399+254}{254+399.253}\)

\(=1\)

\(\frac{254\times399-145}{254+399\times253}\)

\(=\frac{\left(253+1\right)\times399-145}{254+399\times253}\)

\(=\frac{253\times399+399-145}{254+399\times253}\)

\(=\frac{253\times399+254}{254+399\times253}\)

\(=1\)

\(\frac{254\times399-145}{254+399\times253}\)

\(=\frac{\left(253+1\right)\times399-145}{399\times253+254}\)

\(=\frac{253\times399+399\times1-145}{399\times253+254}\)

\(=\frac{253\times399+399-145}{399\times253+254}\)

\(=\frac{253\times399+254}{399\times253+254}\)

\(=1\)

bang 1

Kết quả = 0.9999802373

\(\frac{254\cdot399-147}{254+399\cdot253}=0,9989930998\)

Nhớ click cho mik nha !!!!!!!!!!!!!!!!

Lấy máy tính là ra luôn

\(\frac{254.399-145}{254+399.253}\)

\(=\frac{253.399+399-145}{254+399.253}\)

\(=\frac{253.399+253}{254+399.253}\)

\(=1\)

\(\Rightarrow\)

\(\text{Trả lời : }\)

\(\frac{254\cdot399-145}{254+399\cdot253}=\frac{399-145}{254}=\frac{254}{254}=1\)

\(\text{Chúc bạn học tốt ! }\)

Bạn Phúc làm đúng rồi càn bạn kia lam sai

\(\frac{254.399-145}{254+399.253}=\frac{\left(253+1\right).399-145}{254+399.253}=\frac{253.399+399-145}{254+399.253}=\frac{253.399+254}{254+399.253}=1\)

bằng 1 đó

= 1 nha

101201/101201

ghép đầu cuối dăt chung 399 ra ngoài 

kq vẫn như cũ chắc chắn 100% 

202292.4291

\(\frac{254+399.253}{399.254-145}\)

\(=\frac{254+399.253}{399.\left(253+1\right)-145}\)

\(=\frac{254+399.253}{399.253+399.1-145}\)

\(=\frac{254+1}{1+399-145}=1\)

Chúc bạn học tốt!!!