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5 Calculează:
a) 7+ 8 +67-3x7
9 +5 6-25:5
b) 7 x 6-12 + 7 x 10
15 - 15:3 + 2 x 5 x 5
c) 400 + 5 x 8 + 72:9-48
300 - 64:8 + 6 x 6 - 28​