有理数:(-0.2)+(+3.3)+2.7+(-29/5)=

问题描述:

有理数:(-0.2)+(+3.3)+2.7+(-29/5)=

=-0.2+3.3+2.7-5.8
=-(0.2+5.8)+(3.2+2.7)
=-6+6
=0