4/5*7.7-(80%-3.3*0.8)

问题描述:

4/5*7.7-(80%-3.3*0.8)

4/5*7.7-(80%-3.3*0.8)
=0.8x7.7-0.8+3.3x0.8
=0.8x(7.7-1+3.3)
=0.8x10
=8