Question

Aflati:
3% din 60
4%din 80
20%din 420
15% din 40% din 800
Rezolvari complete
Dau coroana

Answer 1

$1) \frac{3}{100} \times 60 = \frac{3 \times 60}{100} = \frac{3 \times 6}{10} = \frac{18}{10} = \frac{9}{5} = 1.8$

$2) \frac{4}{100} \times 80 = \frac{4 \times 80}{100} = \frac{4 \times 8}{10} = \frac{32}{10} = \frac{16}{5} = 3.2$

$3) \frac{20}{100} \times 420 = \frac{20 \times 420}{100} = \frac{2 \times 42}{1} = 2 \times 42 = 84$

$4) \frac{15}{100} \times \frac{40}{100} \times 800 = \frac{15 \times 40 \times 800}{100 \times 100} = \frac{15 \times 4 \times 8}{1 \times 10} = \frac{15 \times 4 \times 8}{10} = \frac{15 \times 2 \times 8}{5} = \frac{30 \times 8}{25} = \frac{240}{5}=48$

Answer 2

3% din 60 ⇒ 3 × 60 /100 = 180/100 = 1,8 

4%  din 80 ⇒ 4 × 80 / 100 = 320/100 = 3,2 

20%  din 420 ⇒ 20 × 420/100 = 8 400/100 = 84 

15% din 40% din 800 ⇒ 15 × 320 /100 = 4800/100 = 48 

40 % din 800 ⇒ 40 × 800 / 100 = 40 × 8 = 320