1+2+3`````+9=.155/5+12-6=.155/3X2+60/4=.50/5X60/3=.

问题描述:

1+2+3`````+9=.155/5+12-6=.155/3X2+60/4=.50/5X60/3=.

1+2+3`````+9=(1+9)*9/2=45 155/5+12-6=31+6=37 155/3X2+60/4=62+15=77 50/5X60/3=10*20=200