题目:(0.6)+1.7+(0.6)+(-1.7)+(-9) -3-4+19-11+2(-5/12)+1/12+1/5+(-13/15)-(-18)+12-15+(-7)-7.5+4.7-(-8.9)+(-6)-2/3+1/6- 3 又1/2+1一定要全正确的,谢谢,过程也要详细,解答较好的加分!很急的!!!