№ 2. Вычислите: 1) 5 • 3/16, 2) 18 • 4/9, 3) 13/27 • 3, 4) 11/40 • 16.

№ 2. Вычислите: 1) $$5 \cdot \frac{3}{16} = \frac{5 \cdot 3}{16} = \frac{15}{16}$$; 2) $$18 \cdot \frac{4}{9} = \frac{18 \cdot 4}{9} = \frac{2 \cdot 9 \cdot 4}{9} = 2 \cdot 4 = 8$$; 3) $$\frac{13}{27} \cdot 3 = \frac{13 \cdot 3}{27} = \frac{13 \cdot 3}{9 \cdot 3} = \frac{13}{9} = 1\frac{4}{9}$$; 4) $$\frac{11}{40} \cdot 16 = \frac{11 \cdot 16}{40} = \frac{11 \cdot 2 \cdot 8}{5 \cdot 8} = \frac{11 \cdot 2}{5} = \frac{22}{5} = 4 \frac{2}{5}$$.