a) = 23 - 13 = 10
b) = 4 + 5 = 9
c) = 3² · 7 - 2³ · 5 = 63 - 40 = 23
d) = 4 · 10 + 2² · 3 = 40 + 12 = 52
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a) = 23 - 13 = 10
b) = 4 + 5 = 9
c) = 3² · 7 - 2³ · 5 = 63 - 40 = 23
d) = 4 · 10 + 2² · 3 = 40 + 12 = 52