Exercise 1.1 1 Fill in the blanks. (a) (-9)+ (_) = (5) + ( (c) 12-12. = 24 (e) (-54)-(-21) = -(.) (8) (-21) + = -21 (b) (_ (d) (_ (f) (-255) - (h) ) + 25 = 0 ) + (-15)=(___)+(-3) is not defined (-98) = 0
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