Răspuns:
Explicație pas cu pas:
(3/8 - 2/5) : 2/5 + 1/2 - 3/4
= (15/40 - 16/40) : 2/5 + 1/2 - 3/4
= -1/40 *5/2 + 1/2 - 3/4
= -1/16 + 8/16 - 12/16
= 7/16 - 12/16
= -5/16
