(-3.75)+2.85+(-1又4/1）+（-2/1）+3.5+（-2.5）我算不出来了，

(-3.75)+2.85+(-1又4/1）+（-2/1）+3.5+（-2.5）我算不出来了，
(-3.75)+2.85+(-1又4/1）+（-2/1）+3.5+（-2.5）
我算不出来了，

(-3.75)+2.85+(-1又4/1）+（-2/1）+3.5+（-2.5）我算不出来了，
原式=(-3.75)+2.85+(-1又1/4)+(-1/2)+3.5+(-2.5)
=-3.75+2.85-1.25-0.5+3.5-2.5
=(2.85+3.5)-(3.75+1.25+0.5+2.5)
=6.35-8
=-(8-6.35)
=-1.65

-3.15