8+4-9/5-7 等于多少?

8+4-9/5-7 等于多少?
8+4-9/5-7 等于多少?

8+4-9/5-7 等于多少?
你好!
8+4-9/5-7
=8+4-1.8-7
=12-1.8-7
=10.2-7
=3.2
祝你学习进步,望采纳,谢谢!1O(∩_∩)O~

8+4-9/5-7
=8+4-7-1.8
=8+4-7-1-0.8
=4-0.8
=3.2

8+4-9/5-7=5-9/5=4-4/5=3.2

8+4-9/5-7
=12-1.8-7
=3.2