-5×(-8又7/9)-(-7)×(+79/9)+12÷-(-9/79)-5×(-8又7/9)-(-7)×(+79/9)+12÷(-9/79)

问题描述:

-5×(-8又7/9)-(-7)×(+79/9)+12÷-(-9/79)
-5×(-8又7/9)-(-7)×(+79/9)+12÷(-9/79)