第20页

信息发布者:
D
解:原式=$13+(-23)=-(23-13)=-10$
解:原式= $(-37)+(-28)=-(37+28)=-65$
解:原式= $(-5)+5=0$
解:原式= $0+(-\dfrac{3}{4})=-\dfrac{3}{4}$
解:原式= $(-0.9)+1.6=1.6-0.9=0.7$
解:原式= $(-\dfrac{1}{3})+(-\dfrac{2}{3})=-(\dfrac{1}{3}+\dfrac{2}{3})=-1$
解:原式=$(-19)+53 = 53 - 19 = 34$
解:原式= $72+(-180) = -(180 - 72) = -108$
解:原式= $0.5+(-\dfrac{3}{5}) = 0.5 - 0.6 = -0.1$
解:原式= $(-\dfrac{1}{3})+(-\dfrac{1}{6}) = -(\dfrac{1}{3}+\dfrac{1}{6}) = -\dfrac{1}{2}$