Вычислить 2 2/5-(1/4+7/10)

2 2/5-(1/4+7/10)=1 9/20 1)1/4+7/10=5/20+14/20=19/20 2)2 2/5-19/20=2 8/20-19/20=1 9/20

2•[latex] \frac{2}{5} [/latex]-([latex] \frac{1}{4} [/latex]+[latex] \frac{7}{10} [/latex]) [latex] \frac{4}{5} [/latex]-[latex] \frac{5+14}{20} [/latex] [latex] \frac{4}{5} [/latex]-[latex] \frac{19}{20} [/latex] [latex] \frac{16-19}{20} [/latex] Ответ: -[latex] \frac{3}{20} [/latex]