Найдите значение выражения a + b + (−18), если:
а) a = 15, b = −17;
б) a = −14, b = −12;
в) a = −40, b = 25;
г) a = +16, b = −28.
a + b + (−18) = 15 + (−17) + (−18) = 15 − 17 − 18 = −2 − 18 = −20
a + b + (−18) = (−14) + (−12) + (−18) = −14 − 12 − 18 = −14 − 30 = −44
a + b + (−18) = (−40) + 25 + (−18) = −40 + 25 − 18 = −58 + 25 = −33
a + b + (−18) = 16 + (−28) + (−18) = 16 − 28 − 18 = −12 − 18 = −30
