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20 + (3 × 4) + (7 × 5) = 20 + 12 + 35 = 67
(20 + 3) × (4 + 7) × 5 = 23 × 11 × 5 = 1265
Pozdrawiam
b) 20+(3*4+7*5)
c) 20+3*4+(7*5