Question

Calvulati: a). 1,7(2) + 1,72 +17,2.
b).2,1+3,(15)
URGENT VA ROG!

Answer 1

Rezolvarea exercitiilor

Answer 2

$a)1.7(2) + 1.72 + 17.2$

$= 1 \frac{72 - 7}{90} + \frac{172}{100} + \frac{172}{10}$

$= 1\frac{65}{90} + \frac{172}{100} + \frac{172}{10}$

$= \frac{1 \times 90 + 65}{90} + \frac{172}{100} + \frac{172}{10}$

$= \frac{90 + 65}{90} + \frac{172}{100} + \frac{172}{10}$

$= \frac{155}{90} + \frac{172}{100} + \frac{172}{10}$

$= \frac{1550}{900} + \frac{1548}{900} + \frac{15480}{900}$

$= \frac{1550 + 1548 + 15480}{900}$

$= \frac{18578}{900}$

$= \frac{9289}{450}$

$b)2.1 + 3.(15)$

$= \frac{21}{10} + 3 \frac{15}{99}$

$= \frac{21}{10} + \frac{3 \times 99 + 15}{99}$

$= \frac{21}{10} + \frac{297 + 15}{99}$

$= \frac{21}{10} + \frac{312}{99}$

$= \frac{2079}{990} + \frac{3120}{990}$

$= \frac{2079 + 3120}{990}$

$= \frac{5199}{990}$

$= \frac{1733}{330}$