(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6

问题描述:

(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6
(4)45+(-9)+(-91)+15求大家帮帮忙,这是下学期的,我还没学,这四道实在不会
要赶快,马上就要交了

(1)0.65+(-1.9)+(-0.1)+(-0.65) =-2(2)(-5.4)+0.2+(-0.6)+0.8=(-5.4)+(-0.6)+0.2+0.8=-6+1=-5(3)0.65+(-1.9)+(-0.1)+(-0.6)=0.65-2.6=-1.95(4)45+(-9)+(-91)+15=45+15+(-...