列式计算: ①99与81的和除以99与81的差,求商. ②60减去5,再除550,商是多少?

2025-05-01 11:01:49
推荐回答(1个)
回答1:

(1)(99+81)÷(99-81),
=180÷18,
=10;

(2)550÷(60-5);
=550÷55;
=10.