我来,先别采别人等你1. 33.1-(-22.9)+(-10.5)=33.1+22.9-10.5=56-10.5=45.5 2.(-8)-(-15)+(-9)-(-12)=-8+15-9+12=7-9+12=-2+12 =10 3.-2/3+(-1/6)-(-1/4)-1/2=-2/3-1/6+1/4-1/2=(-2*4-2+3-6)/12=(-8-2+3-6)/12=-13/12 4.3/5-3...
我来,先别采别人等你1. 33.1-(-22.9)+(-10.5)=33.1+22.9-10.5=56-10.5=45.5 2.(-8)-(-15)+(-9)-(-12)=-8+15-9+12=7-9+12=-2+12 =10 3.-2/3+(-1/6)-(-1/4)-1/2=-2/3-1/6+1/4-1/2=(-2*4-2+3-6)/12=(-8-2+3-6)/12=-13/12 4.3/5-3...