5x-[-x平方-(x+2)]如何化简

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5x-[-x平方-(x+2)]如何化简5x-[-x平方-(x+2)]如何化简5x-[-x平方-(x+2)]如何化简5x-[-x²-(x+2)]=5x-(-x²-x-2)=5x+x&

5x-[-x平方-(x+2)]如何化简
5x-[-x平方-(x+2)]如何化简

5x-[-x平方-(x+2)]如何化简
5x-[-x²-(x+2)]
=5x-(-x²-x-2)
=5x+x²+x+2
=x²+6x+2

5x-[-x平方-(x+2)]

=5x-(-x平方-x-2)
=5x+x平方+x+2
=6x+x平方+2

5x-[-x²-(x+2)]
=5x-(-x²-x-2)
=5x+x²+x+2
=x²+6x+2
=(x+3)²-7