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3/7 + 1/3
7×1 y 3×3
7 y 9
Ahora multiplicamos en recta
7×3
21
Ahora ordenamos y sumamos.
7+9/21
16/21 Rpta
b)
11/15 + 1/6
15+66/90
81/90
9/10 Rpta
c)
1/11 + 5/9
55+9/99
64/99 Rpta
d)
1/8 + 7/15
56+15/120
71/120 Rpta
11/15 + 1/6 = (11*6 + 1*15)/(15*6) = (66+15)/90 = 81/90 = 9/10
1/11 + 5/9 = (1*9 + 5*11)/(11*9) = (9+55)/99 = 64/99
1/8 + 7/15 = (1*15 + 7*8)/(8*15) = (15+56)/120 = 71/120