ПОВТОРЮЄМО АЛГЕБРУ ЗА 8 КЛАС: 48

48. Обчисліть:

1) $\sqrt{4\frac{66}{64}•4\frac{21}{25}}$ = $\sqrt{\frac{289}{64}•\frac{121}{25}}$ = $\frac{17}{8}$ • $\frac{11}{5}$ = $\frac{17}{8}$ • $\frac{11}{5}$ = $\frac{187}{40}$ = 4$\frac{27}{40}$;

2) $\sqrt{3\frac{4}{5}}$ • $\sqrt{6\frac{11}{19}}$ = $\sqrt{\frac{19}{5}•\frac{125}{19}}$= $\sqrt{25}$ = 5;

3) $\sqrt{175}$ • $\sqrt{28}$ = $\sqrt{175•28}$ = $\sqrt{4900}$ = 70;

4) $\sqrt{{25}^3}$ = $\sqrt{{25•25}^2}$ = 5 • 25 = 125.