True: -4+6=2, -10 + 5 =-5, -20 + 36 = 16, -60+80=20, -33-12=45, 91+10=-81, (-3). (- 1). (- 2) = - 6, (+ 15): (+ 3) = + 5, False: -4+6=5, -10 + 5 =2, -20 + 36 = 20, -60+80=88, -33-12=60, 91 + 10 =70, (-3). (- 1). (- 2) =22, (+ 15): (+ 3) = -9,

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