Помогите решить: 1) (-5\8) * (-4\5) * (-3\4) * (-2\3) * (-1\2) = 2) (-7\12) * (-6\7) * (-5\6) * (-4\5) +2\3 = 3) (-11\15) * (-10\11) * (-9\10) + (-7\9) * (-6\7) + 4\15 =. Created by Zverevazoechka. matematika-ru

Помогите решить: 1) (-5\8) * (-4\5) * (-3\4) * (-2\3) * (-1\2) = 2) (-7\12) * (-...

July 2022 1 8 Report

Помогите решить:
1) (-5\8) * (-4\5) * (-3\4) * (-2\3) * (-1\2) =
2) (-7\12) * (-6\7) * (-5\6) * (-4\5) +2\3 =
3) (-11\15) * (-10\11) * (-9\10) + (-7\9) * (-6\7) + 4\15 =

Answers & Comments

TomikoByanka

Ответ:

1) $-\frac{5}{8} *-\frac{4}{5} *-\frac{3}{4} *-\frac{2}{3} *-\frac{1}{2} =\frac{1}{2} *\frac{1}{2} *-\frac{1}{2} =-\frac{1}{8}$

2) $-\frac{7}{12}* -\frac{6}{7} *-\frac{5}{6}* -\frac{4}{5} +\frac{2}{3} =\frac{1}{2} *\frac{2}{3} +\frac{2}{3}=\frac{1}{3}+\frac{2}{3}=\frac{3}{3}=1$

3) $-\frac{11}{15}*- \frac{10}{11}*- \frac{9}{10}+(- \frac{7}{9}) *- \frac{6}{7}+\frac{4}{15} =\frac{2}{3} *-\frac{9}{10} +(- \frac{7}{9}) *- \frac{6}{7}+\frac{4}{15} =-\frac{3}{5} + \frac{2}{3} +\frac{4}{15} =-\frac{9}{15} +\frac{10}{15} +\frac{4}{15} =\frac{5}{15} =\frac{1}{3}$

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