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\(\frac{254\times399-145}{254+399\times253}\)
\(=\frac{\left(253+1\right)\times399-145}{399\times253+254}\)
\(=\frac{253\times399+399\times1-145}{399\times253+254}\)
\(=\frac{253\times399+399-145}{399\times253+254}\)
\(=\frac{253\times399+254}{399\times253+254}\)
\(=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{254\times399-145}{254+399\times253}\)
=\(\frac{253\times399+399-145}{254+399\times253}\)
=\(\frac{253\times399+254}{254+399\times253}\)
=1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{254\cdot399-147}{254+399\cdot253}=0,9989930998\)
Nhớ click cho mik nha !!!!!!!!!!!!!!!!
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Tính nhanh:
a) \(\frac{254.399-145}{254+399.253}\)
\(=\)\(\frac{\left(253+1\right).399-145}{254+399.253}\)
\(=\)\(\frac{253.399+399-145}{254+399.253}\)
\(=\)\(\frac{253.399+254}{254+399.253}\)
\(=\)\(1\)
b) \(\frac{5932+6001.5931}{5932.6001-69}\)
\(=\)\(\frac{5932+6001.5931}{\left(5931+1\right).6001-69}\)
\(=\)\(\frac{5932+6001.5931}{5931.6001+6001-69}\)
\(=\)\(\frac{5932+6001.5931}{5932.6001+5932}\)
\(=\)\(1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
254 x 399 - 145 / 254 + 399 x 253
= 254 x 399 - 154 / ( 253 + 1 ) x 399 + 254
= 254 x 399 + 399 - 154 / 254 x 399 + 254
= 253 + 399 x 254 / 254 + 399 x 254
= 1
Tk nha mina ~!~
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{254\times399-145}{254+399\times253}=\frac{253\times399+399-145}{254+399\times253}=\frac{253\times399+254}{254+399\times253}=1\)
\(\frac{254.399-145}{254+399.253}\)
\(=\frac{\left(253+1\right).399-145}{254+399.253}\)
\(=\frac{253.399+399-145}{254+399.253}\)
\(=\frac{253.399+254}{254+399.253}\)
\(=1\)