Question

so sánh 18/91 với 23/114:

            và 21/52 với 213/523

Answer 1

\(\frac{18}{91}< \frac{18}{90}=\frac{1}{5}\)

\(\frac{23}{114}>\frac{23}{115}=\frac{1}{5}\)

=> \(\frac{18}{91}< \frac{23}{114}\)

\(\frac{21}{52}=\frac{210}{520}=1-\frac{310}{520}\)

\(\frac{213}{523}=1-\frac{310}{523}\)

Vì \(\frac{310}{520}>\frac{310}{523}\)=> \(1-\frac{310}{520}< 1-\frac{310}{523}\)

=> \(\frac{21}{52}< \frac{213}{523}\)

Answer 2

\(\frac{18}{91}< \frac{18}{90}=\frac{1}{5}=\frac{23}{115}< \frac{23}{114}\)

\(=>\frac{18}{91}< \frac{23}{114}\)

Answer 3

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Answer 4