3.146 Вычислите: 1) $$2\frac{1}{4}\cdot 2^3$$; 3) 4,42 + $$(2,5)^3$$; 5) $$3^3\cdot (1\frac{1}{3})^2$$; 2) $$3\frac{1}{5}:2^4$$; 4) 30 - $$(3,6)^2$$; 6) $$(3\frac{3}{4})^2:(1\frac{1}{4})^3$$.

1) $$2\frac{1}{4}\cdot 2^3 = \frac{9}{4} \cdot 8 = 9 \cdot 2 = 18$$ 2) $$3\frac{1}{5}:2^4 = \frac{16}{5}:16 = \frac{1}{5} = 0,2$$ 3) $$4,42 + (2,5)^3 = 4,42 + 2,5 \cdot 2,5 \cdot 2,5 = 4,42 + 6,25 \cdot 2,5 = 4,42 + 15,625 = 20,045$$ 4) $$30 - (3,6)^2 = 30 - 3,6 \cdot 3,6 = 30 - 12,96 = 17,04$$ 5) $$3^3\cdot (1\frac{1}{3})^2 = 27 \cdot (\frac{4}{3})^2 = 27 \cdot \frac{16}{9} = 3 \cdot 16 = 48$$ 6) $$(3\frac{3}{4})^2:(1\frac{1}{4})^3 = (\frac{15}{4})^2 : (\frac{5}{4})^3 = \frac{225}{16} : \frac{125}{64} = \frac{225}{16} \cdot \frac{64}{125} = \frac{225 \cdot 4}{125} = \frac{9 \cdot 4}{5} = \frac{36}{5} = 7,2$$ Ответ: 1) 18; 2) 0,2; 3) 20,045; 4) 17,04; 5) 48; 6) 7,2.