(a) \[\frac{-9}{10}+\frac{22}{15}\] |
(b) \[\frac{5}{63}-\left( \frac{-6}{21} \right)\] |
(c) \[\frac{-6}{5}\times \frac{9}{11}\] |
Answer:
(a) \[\frac{-9}{10}+\frac{22}{15}=\frac{-9\times 3+22\times 2}{30}\] \[=\frac{-27+44}{30}=\frac{17}{30}\] (b) \[\frac{5}{63}+\left( \frac{-6}{21} \right)=\frac{5}{63}+\frac{6}{21}=\frac{5+6\times 3}{63}\] \[=\frac{5+18}{63}=\frac{23}{63}\] (c) \[\frac{-6}{5}+\frac{9}{11}=-\left( \frac{6}{5}\times \frac{9}{11} \right)=-\left( \frac{54}{55} \right)\] \[=\frac{-54}{55}\]
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