3.8÷(1.5×3.8+3.

问题描述:

3.8÷(1.5×3.8+3.

3.8÷(1.5×3.8+3.8)
=3.8÷【3.8×(1.5+1)】
=3.8÷3.8÷2.5
=1÷2.5
=0.4