0.75×3.2-2.5×0.72
=2.5*(0.3*3.2-0.72)
=2.5*0.24
=2.5*4*0.06
=10*0.06
=0.6
手机提问的朋友在客户端右上角评价点【满意】即可.
互相帮助,祝共同进步!