Làm các phép trừ a) (−12) − (−27). b) (−5) − (+8). c) 19 − [15 − (−6)]
Giải thích
a) Ta có (−12) − (−27) = −12 + (+27) = 15.
b) Ta có (−5) − (+8) = (−5) + (−8) = −13.
c) Ta có 19 − [15 − (−6)] = 19 − [15 + (+6)] = 19 − 21 = 19 + (−21) = -2.
a) Ta có (−12) − (−27) = −12 + (+27) = 15.
b) Ta có (−5) − (+8) = (−5) + (−8) = −13.
c) Ta có 19 − [15 − (−6)] = 19 − [15 + (+6)] = 19 − 21 = 19 + (−21) = -2.