C>0, so the square of C under the root sign is C, without absolute value.

B<a<0, so A+B.

The symbol of the cube is unchanged, so the third part is a+b, which offsets the second part.

In the fourth part, we need to discuss the sizes of |a| and |c|. If | a |

Note that there is a symbol in front of the fourth part, and the middle two parts cancel each other out. When added to the first section, the result is:

If | a |

I hope to adopt. . . . . . Exactly, brother. One point will be deducted from the math exam.