解:(一2.6)+(-3.4)+(+2.3)+0.5+(-2.3)
=-2.6-3.4+2.3+0.5-2.3
=-6+0.5+(2.3-2.3)
=-6+0.5
=-5.5
(一2.6)+(-3.4)+(+2.3)+0.5+(-2.3)
=一2.6一3.4+2.3+0.5一2.3
=一(2.6+3.4)+(2.3一2.3)+0.5
=一6+0+0.5
=一5.5
(一2.6)+(-3.4)+(+2.3)+0.5+(-2.3)的过程如下:
解:(一2.6)+(-3.4)+(+2.3)+0.5+(-2.3)
==一2.6一3.4+2.3+0.5一2.3
=一(2.6+3.4)+(2.3一2.3)+0.5
=一6+0+0.5
=一5.5。
原式=-2.6-3.4+0.5+(2.3-2.3)=6+0.5=6.5,过程如上所述。