Question

найдите сумму и разность чисел: 60 и 40, 50 и 30, 40 и 20.

Answer 1

60 + 40 = 100 и 60 - 40 = 20
50 + 30 = 80 и 50 - 30 = 20
40 + 20 = 60 и 40 - 20 = 20