Question

Вычислите: (2/3 √0,09+ 0,78√100) - (4√5)².

Answer 1

$(\dfrac{2}{3}\sqrt{0,09} + 0,78\sqrt{100} ) - (4\sqrt5)^2 = (\dfrac{2}{3}\cdot\sqrt{\dfrac{9}{100}} + 0,78\cdot10)-16\cdot 5=\\\\=(\dfrac{2}{3}\cdot\dfrac{3}{10}+7,8)-80= (\dfrac{1}{5}+\dfrac{39}{5}}) - 80 = 8- 80 = 72$