一杯水重750克,一个空瓶重450克,

2025-07-09 04:07:30
推荐回答(1个)
回答1:

1杯水重:
(750-450)÷(5-2)
=300÷3
=100(克)
1个空瓶重:
450-100x2
=450-200
=250(克)