a.-
4/9 + 8/12 = 32+72/108 = 26/27
b.-
13/15 + 16/3 = 210+39/45 = 83/15
c.-
28/10 - 9/14 = 392-90/140 = 151/70
d.-
45/26 - 18/13 = 585-468/338 =9/26
ojalá ayude
saludos (^∇^)ノ
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a.-
4/9 + 8/12 = 32+72/108 = 26/27
b.-
13/15 + 16/3 = 210+39/45 = 83/15
c.-
28/10 - 9/14 = 392-90/140 = 151/70
d.-
45/26 - 18/13 = 585-468/338 =9/26
ojalá ayude
saludos (^∇^)ノ