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

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

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

=1

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

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

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

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

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

\(=1\)

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

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

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

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

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

\(=1\)

Kết quả = 0.9999802373

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

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

a) 154/253

b) 5931/69

\(a,\frac{154}{253}\)

\(b,\frac{5931}{69}\)

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

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

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

\(=1\)

\(\Rightarrow\)

\(\text{Trả lời : }\)

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

\(\text{Chúc bạn học tốt ! }\)

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

bằng 1 đó

101201/101201

ghép đầu cuối dăt chung 399 ra ngoài 

kq vẫn như cũ chắc chắn 100% 

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