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4+1-1+1—1+1-1~~~~~
=4+(1-1)+(1-1)~~~~~
=4+0 + 0 + 0 + 0 ~~~~~
=4
=4+1(-1+1)+(-1+1)~~~~~
=5+0+0+0+0+~~~~~
=5
4==5?
思考:在无限的领域,一切都有可能,哪些是变的哪些是不变的呢?
4+1-1+1—1+1-1~~~~~
=4+(1-1)+(1-1)~~~~~
=4+0 + 0 + 0 + 0 ~~~~~
=4
=4+1(-1+1)+(-1+1)~~~~~
=5+0+0+0+0+~~~~~
=5
4==5?
思考:在无限的领域,一切都有可能,哪些是变的哪些是不变的呢?