Răspuns:
Explicație pas cu pas:
(19/45-7/30):34/5 = (38/90 - 21/90) : 34/5 = 17/90 : 34/5 = 17/90 x 5/34 = 1/36
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(13/12-7/15):37/30+1/2 = (65/60 - 28/60) : 37/30 + 1/2 = 37/60 : 37/30 + 1/2
= 37/60 x 30/37 + 1/2 = 1/2 + 1/2 = 1
