化简下列多重符号后三题列式+(-12)、+(+2.7)、-[+(-3)]、+{-[+(-5)]}、-[-(-5)]、-{+[-(-6]}、-{-[+(x-y)]}

来源:学生作业帮助网 编辑:作业帮 时间:2021/06/25 17:35:32

化简下列多重符号后三题列式+(-12)、+(+2.7)、-[+(-3)]、+{-[+(-5)]}、-[-(-5)]、-{+[-(-6]}、-{-[+(x-y)]}
化简下列多重符号
后三题列式+(-12)、+(+2.7)、-[+(-3)]、+{-[+(-5)]}、-[-(-5)]、-{+[-(-6]}、-{-[+(x-y)]}

化简下列多重符号后三题列式+(-12)、+(+2.7)、-[+(-3)]、+{-[+(-5)]}、-[-(-5)]、-{+[-(-6]}、-{-[+(x-y)]}
-12+2.7+3+5-5-6+X-Y→
-12.3+X-Y
这是什么题目啊,我读书时咱就从来没做过呢!

-12+2.7+3+5-5-6+x-y=-12.3+x-y