零点九加九点九加九十九点九加九百九十九点九加零点四的简便方法怎么箅

2025-05-05 09:19:56
推荐回答(1个)
回答1:

0.9+9.9+99.9+999.9+0.4
=1-0.1+ 10 - 0.1 + 100-0.1 + 1000-0.1 +0.4
=1111