Resposta:
2.
a) 4/5
b) 5 ²⁄₇ . 3 ²⁄₉ = 37/7 . 29/9 = 1073/63 = 17 ²⁄₆₃
3.
a) 4 ¾ : 5 ²⁄₉ = 19/4 : 47/9 = 19/4 . 9/47 = 171/188
b) 3 ½ : 2 ⅖ = 7/2 : 12/5 = 7/2 . 5/12 = 35/24 = 1 ¹¹⁄₂₄
c) 6 ⅗ : 2 ⁶⁄₇ = 33/5 : 20/7 = 33/5 . 7/20 = 231/100 = 2 ³¹⁄₁₀₀
d) 1 ²⁄₄ : 1 ½ = 6/4 : 3/2 = 6/4 . 2/3 = 12/12 = 1
