2/5+(1/4+3/4)
2/5+1
2/5+1/1
2/5+5/5
7/5
60/8-6/8-15/20
27/4-15/20
135/20-15/20
6
\(\frac{2}{5}+\frac{3}{4}+\frac{1}{4}\)
\(=\frac{2}{5}+1\)
\(=\frac{2}{5}+\frac{5}{5}\)
\(=\frac{7}{5}\)
\(\frac{30}{4}-\frac{6}{8}-\frac{15}{20}\)
\(=\frac{30}{4}-\frac{3}{4}-\frac{3}{4}\)
\(=\frac{24}{4}=6\)
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Trả lời:
\(\frac{2}{5}+\frac{3}{4}+\frac{1}{4}\)
\(=\frac{2}{5}+1\)
\(=\frac{7}{5}\)
\(\frac{30}{4}-\frac{6}{8}-\frac{15}{20}\)
\(=\frac{30}{4}-\frac{3}{4}-\frac{3}{4}\)
\(=\frac{24}{4}\)
\(=6\)