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Rezolvă, după model:
(24: 6) + (30 : 6) = (24 +30): 6 = 54 : 6 = 9
a) (25:5) + (15: 5) =
(40: 8) + (32 : 8) =
b) (42 : 7) + (14 : 7) =
(16:4) + (24 : 4) =​