я не понимаю помогите:

Напишите сумму:

1) 256-16 и 3+14;

2)a+86 и 91;

3) x+32  и y + 13;

4) т - 16 и n + 56;

Напишите разность:

1) 13 + 65 и 11 + 54

2) a + 86 и 91;

3)181 + b и 195- x

4) x-16 и y-24

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