7÷(-7/3)÷(-4/5)÷(+4/5)等于?急及急

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7÷(-7/3)÷(-4/5)÷(+4/5)等于?急及急7÷(-7/3)÷(-4/5)÷(+4/5)等于?急及急7÷(-7/3)÷(-4/5)÷(+4/5)等于?急及急7÷(-7/3)÷(-4/5)÷

7÷(-7/3)÷(-4/5)÷(+4/5)等于?急及急
7÷(-7/3)÷(-4/5)÷(+4/5)等于?
急及急

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