7÷(-7/3)÷(-4/5)÷(+4/5)等于?急及急

问题描述:

7÷(-7/3)÷(-4/5)÷(+4/5)等于?
急及急

7÷(-7/3)÷(-4/5)÷(+4/5)
=7×3/7 ÷(4/5×4/5)
=3÷16/25
=3×25/16
=75/16