Question

Упростить выражение. 8/15(2 1/4a-7 1/2b)-13/30(4 8/13- a-7 2/13) Даю 20баллов​

Answer 1

$\displaystyle \frac{8}{15}(2\frac{1}{4}a-7\frac{1}{2}b)-\frac{13}{30}(4\frac{8}{13}-a-7\frac{2}{13})=\frac{8}{15}(\frac{9}{4}a-\frac{15}{2}b)-\frac{13}{30}(\frac{60}{13}-a-\frac{93}{13})=\\ \\ \frac{6}{5}a-4b-\frac{13}{30}(-\frac{33}{13}-a)=\frac{6}{5}a-4b+\frac{11}{10}+\frac{13}{30}a=\frac{49}{30}a-4b+\frac{11}{10}$