Question

2. Упростите выражение:
8
7 2
2-а – 7-b
4
15
30 7
в (24-756) =-)
4
-8 - b
6

Answer 1

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