(-2.7)-(+2.3),(-27)-(-18)-6,两题要有过程
问题描述:
(-2.7)-(+2.3),(-27)-(-18)-6,两题要有过程
答
(-2.7)-(+2.3)
=-2.7-2.3
=-(2.7+2.3)
=-5
(-27)-(-18)-6
=-27+18-6
=-9-6
=-15