Answer? = 3?

So a=3 or -3.

What if |a+3|+(b-2)? =0

Absolute value and mean square error are greater than or equal to 0.

The sum is equal to 0, one is greater than 0 and the other is less than 0, which is not true.

So both are equal to 0.

So a+3 = 0 and b-2 = 0.

a=-3，b=2

-a to the b power =-(-3)? =-9

2. If A and B are antonyms.

a+b=0

So a+2a+...+5a+5b+4b+...+b

=(a+b)+(2a+2b)+(3a+3b)+(4a+4b)+(5a+5b)

=(a+b)+2(a+b)+3(a+b)+4(a+b)+5(a+b)

=0+0+0+0+0

=0