Question

РАЗЛОЖИТЕ НА МНОЖИТЕЛИ ПОЖАЛУЙСТА СРОЧНО!6 ЗАДАНИЕ!!!

Answer 1

$1)7-b\sqrt{7} =(\sqrt{7})^{2} -b\sqrt{7} =\sqrt{7}(\sqrt{7}-b)\\\\2)\sqrt{12}-\sqrt{15}=\sqrt{4*3}-\sqrt{5*3}=2\sqrt{3}-\sqrt{5}*\sqrt{3} =\sqrt{3}(2-\sqrt{5})\\\\3)7-4y^{2}=(\sqrt{7})^{2}-(2y)^{2}=(\sqrt{7} -2y)(\sqrt{7}+2y)$

$4)m+2\sqrt{mn} +n=(\sqrt{m})^{2}+2\sqrt{m}*\sqrt{n}+(\sqrt{n})^{2}=(\sqrt{m}+\sqrt{n})^{2}\\\\5)2\sqrt{b}+10\sqrt{a}-\sqrt{ab}-5a=(2\sqrt{b} -\sqrt{ab})+(10\sqrt{a} -5a)=\sqrt{b}(2-\sqrt{a})+5\sqrt{a}(2-\sqrt{a})=(2-\sqrt{a})(\sqrt{b}+5\sqrt{a})$