Question

alege raspunsul corect ex 1,2,3,4,5,6​

Answer 1

Explicație pas cu pas:

sper că te-am ajutat, succes

Answer 2

Răspuns:

1. c) 14

2. R: d) 9;

$\frac{x}{15} = \frac{12}{20} \\ 20x = 12 \times 15 \\ 20x = 180 \\ x = 180 \div 20 \\ x = 9$

3. R: a) 7,5

$\frac{2 \times 3 + 1 \times 4 + 2 \times 5 + 2 \times 6 + 8 \times 7 + 3 \times 8 + 7 \times 9 + 5 \times 10}{2 + 1 + 2 + 2 + 8 + 3 + 7 + 5} \\ \frac{6 + 4 + 10 + 12 + 56 + 24 + 63 + 50}{30} = \frac{225}{30} = 7.5$

4. R: d) 5/6.

5. R: d) 4.

$m _{a} = \frac{4 + \sqrt{12} + 4 - 2 \sqrt{3} }{2} = \frac{4 + 2\sqrt{3} + 4 - 2 \sqrt{3} }{2} = \frac{8}{2 } = 4$

6. R: b) fals.