Question

am nevoie urgent!!!!​

Answer 1

Răspuns:

$|7 - 5 \sqrt{2} | + \frac{30}{ \sqrt{18} + 6 } = \\ \\ = 5 \sqrt{2} - 7 + \frac{30}{3 \sqrt{2} + 6 } = \\ \\ = 5 \sqrt{2} - 7 + \frac{10}{ \sqrt{2} + 2} = \\ \\ = 5 \sqrt{2} - 7 + \frac{10( {2} - \sqrt{2}) }{2} = \\ \\ = 5 \sqrt{2} - 7 + 5(2 - \sqrt{2} ) = \\ \\ = 5 \sqrt{2} - 7 + 10 - 5 \sqrt{2} = \\ \\ = 10 - 7 = \\ \\ = 3$

Succes!

Answer 2

|7-$5\sqrt2$|+$\frac{30}{\sqrt18+6}$ = $5\sqrt2 - 7 + \frac{30}{3\sqrt2+6}$ = $5\sqrt2-7+\frac{30}{3(\sqrt2+2}$ = $5\sqrt2 - 7 + \frac{10}{\sqrt2+2}$

$5\sqrt2 - 7 - 5(\sqrt2-2)$ = $5\sqrt2 -7-5\sqrt2+10$ = -7+10 = 3

b) Sofia