Question

简便计算。4.2÷(5.25÷0.25)

Answer 1

因题干条件不完整，缺少文字，不能正常作答。

Answer 2

4.2/(5.25+0.25)
=4.2/5.5
=0.7636363636。

追问

简便计算

追答

4.2/(5.25/0.25)
=4.2/21
=0.2。