Question

Repede!!!!!!!?!!!!!! #? #(192(2)))2)1​

Answer 1

a+b

$2 \sqrt{5} + 5 \sqrt{5} = (2 + 5) \sqrt{5} = 7 \sqrt{5}$

a-b

$2 \sqrt{5} - 5 \sqrt{5} = (2 - 5) \sqrt{5} = - 3 \sqrt{5}$

a•b

$2 \sqrt{5} \times 5 \sqrt{5} = 2 \times 5 \times \sqrt{5} {}^{2} \\ = 10 \times 5 = 50$

a:b

$\huge\frac{2 \sqrt{5} }{5 \sqrt{5} } = \frac{2}{5}$

se simplifica prin ✓5