Question

dau coroana!!!//^^^&^$/$###$€€___​

Answer 1

Explicație pas cu pas:

1.

$\frac{2}{7} = \frac{ {x}^{2} }{56} \\ {x}^{2} = \frac{2 \times 56}{7} \\ {x}^{2} = 2 \times 8 = 16 \\ x = 4$

2.

$18 = 2 \times {3}^{2} \\ 12 = {2}^{2} \times 3 \\ cmmdc = 2 \times 3 = 6$

3.

$\frac{40}{65} = \frac{40 \div 5}{65 \div 5} = \frac{8}{13}$

4. 16% = 16/100 = 4/25