Question

8,8а+3/25 при а=0,1
7/20+165b при b=0,01
0,002а-3/4 при а=1000
4/5-0,003 при b=100

Answer 1

$\displaystyle 8,8 \cdot 0,1+ \frac{3}{25}= \frac{88}{100}+ \frac{3}{25}= \frac{22}{25}+ \frac{3}{25}= \frac{25}{25}=1$

$\displaystyle \frac{7}{20}+165 \cdot 0,01= \frac{7}{20}+ 1,65= \frac{7}{20}+ \frac{165}{100}= \frac{7}{20}+ \frac{33}{20}= \frac{40}{20}=2$

$\displaystyle 0,002\cdot 1000- \frac{3}{4}= 2- \frac{3}{4}= \frac{8}{4}- \frac{3}{4}= \frac{5}{4}=1,25$

$\displaystyle \frac{4}{5}-0,003 \cdot 100 = \frac{4}{5}-0,3= \frac{4}{5}-\frac{3}{10}=\frac{8}{10}- \frac{3}{10}= \frac{5}{10}= \frac{1}{2}=0,5$