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b) -47- (-63) = -47 + 63 = 16
c) -240 * (-3) = 720
d) -342 + (-139) = -342 - 139 = -481
e) 7 * (-4) - 2 * (-3) * (-5) = -28 - 2 * 15 = -28 - 30 = -58
f) 2 * (-5)^2 - (-3) - (-3^2) - (-2)^2 = 2 * 25 + 3 - (-9) - 4 = 50 + 3 + 9 - 4 = 58
Pozdrawiam ;-)
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