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a) 3x12 - 3 = 36 - 3 = 33
b) 12 + 6x3 = 12 +18 = 30
c) 26 - 4x4 = 26 - 16 = 10
Zadanie 2)
(20+3)x4 + 7x5 = 92 +36 = 127
20 + 3x(4+7)x5 = 20+ 15x11 = 20 + 165 = 185
20 + 3x(4+7x5) = 20 + 3x(4+35) = 20 + 3x39 = 20 + 117 = 137