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1) a) (2) (13) = b) (-45).(+2) = c) (-15).(-20) = 2) a) (17+2+19-3) (+25-8+1-26) = b) (+36-8+3-35) (-12-1+7+13) = c) (-27+4-5+21) (+78-3-79+2) = 3) a) (1+36-32) · (-8 +52-41) = b) (+39-28-17) (12-47 +63) = c) (+72-36-35) (11 +75-68) = 4) a) (+258-189-96) (279 +421-156) = b) (-239 +497-253) (+91-663 +391) = c) (-56 +82-21). (+362-301-257) = 5) a)-2 [4+3 (29+3+28)-2 (+ 14-15 + 2)] = b) +5. [+ 8-3 (6+38-34)+2 (25+26-3)] = c)-7.[2+5 (+ 18-13-6)-4 (17+1+14)] = ●​