Срочно! 40 баллов! Помогите решить пожалуйста примеры (с развернутым ответом) [tex]1) (\sqrt{7})^{2} -\sqrt{1,21}\\2) (4\sqrt{3})^{2} -(3\sqrt{5})^{2}\\3) 32*(-\frac{1}{2}\sqrt{11})^{2}-\frac{1}{3}*(7\sqrt{75})^{2}\\4) \sqrt{784}-(\frac{1}{7}\sqrt{343})^{2}\\[/tex]. Created by artem066014. algebra-ru

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1) $(\sqrt{7})^2 - \sqrt{1,21} = 7 - 1,1 = \boxed{\textbf{5,9}}$ .

2) $(4\sqrt{3})^2 - (3\sqrt{5})^2 = 16\cdot 3 - 9\cdot 5 = 48 - 45 = \boxed{\textbf{3}}$ .

$32\left(-\dfrac{1}{2}\sqrt{11}\right )^2 - \dfrac{1}{3} (7\sqrt{75})^2 = 32\cdot \dfrac{1}{4} \cdot 11 - \dfrac{1}{3} \cdot 49\cdot 75 = \dfrac{32\cdot 11}{4} - \dfrac{49\cdot 75}{3} =\\\\\\= 8\cdot 11 - 49\cdot 25 = 88 - 1225 = \boxed{\textbf{-1137}}$

$\sqrt{784} - \left(\dfrac{1}{7}\sqrt{343}\right )^2 = 28 - \dfrac{1}{49}\cdot 343 = 28 - \dfrac{343}{49} = 28 - 7 = \boxed{\textbf{21}}$ .

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