Question

помогите пожалуйста!!!!!

Answer 1

$\displaystyle\bf\\2\sqrt{18+7} -\sqrt{144} =2\sqrt{25} -\sqrt{144} =2\sqrt{5^{2} } -\sqrt{12^{2} } =\\\\\\=2\cdot 5-12=10-12=-2\\\\\\Otvet \ : \ -2$