969. Вычислите значение выражения: 1) −1/4 + 3/5; 2) 9/11 + (−2/5); 3) −20/21 + 3/7; 4) 7 5/12 + (−3 7/24); 5) −6 11/12 + (−8 13/18); 6) −5 12/35 + 10; 7) −3 1/12 + 1/6; 8) 3 6/7 + (−6 4/9); 9) 9 1/6 + (−5 3/4).

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Accepted Answer

\(-\frac14+\frac35=\frac7{20}\).
\(\frac9{11}-\frac25=\frac{23}{55}\).
\(-\frac{20}{21}+\frac37=-\frac{11}{21}\).
\(7\frac5{12}-3\frac7{24}=4\frac18\).
\(-6\frac{11}{12}-8\frac{13}{18}=-15\frac13\).
\(-5\frac{12}{35}+10=4\frac{23}{35}\).
\(-3\frac1{12}+\frac16=-2\frac{11}{12}\).
\(3\frac67-6\frac49=-2\frac{37}{63}\).
\(9\frac16-5\frac34=3\frac5{12}\).

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