Question

我有点不懂..上课没听讲拉!5555

Answer 1

-6+3-2-6+7=-4

24/12-5/12+1/12-5/18-7/18-42/17=20/12-12/18-42/17=1-42/17=-25/17

1又1/2=3/2 3/2-5/6+11/4+3/8-14/3=18/12-10/12+33/12-56/12+3/8=18-10+33-56/12+3/8=-15/12+3/8=-5/4+3/8=-10/8+3/8=-7/8

1+2-3=0-4+5+6-7=0.-2008=-2008