Question

pfvr preciso do cálculo ​

Answer 1

Resposta:

07:

$\sqrt{x-9}\ -\ \sqrt{x-18}=1\\\sqrt{x-9}^2=(1+\sqrt{x-18})^2\\x-9=1+2\sqrt{x-18}+x-18\\8^2=(2\sqrt{x-18})^2\\64=4\times x-18\\x=20.5$

08:

???

09:

$x+\sqrt{x-1}=1\\\sqrt{x-1}^2=(1-x)^2\\x-1=1-2x+x^2\\x^2-3x+2=0\\S=\{1, 2\}\\\\x^x=1^1=1\\e:\\x^x=2^2=4$

10:

ilegível.

11:

$\sqrt{x-1+\sqrt{2x-2}}=2\\x-1+\sqrt{2x-2}=4\\\sqrt{2x-2}^2=(5-x)^2\\2x-2=25-10x+x^2\\x^2-12x+27=0\\S=\{3, 9\}$

12:

ilegível.