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Math problem: about the simplification of removing brackets: [removing brackets]
1a-4-AA- 1 squared;

=a? -4a? +a=a-4

2 the square of one-half 5a -2ab-the square of one-third 3a+4ab-the square of one-half b;

=0.5(5a? -2ab)-( 1/3)(3a? +4ab-0.5b? )

=2.5a? -ab-(a? +4ab/3-b? /6)

= 1.5a? -7ab/3+b? /6

35a's square b-3ab's square-half A's square b-ab's square -0.5a's square b+3a's square B;

=5a? -3ab? -(0.5a? b-ab? -0.5a? b)+3a? b

=5a? -3ab? -ab? +3a? b

=5a? -4ab? +3a? b

4-3 [square of a+1- square of one-sixth 2a +a+ one-third a-5].

=-3(a? + 1)-( 1/6)(2a? +a)+( 1/3)(a-5)

=-3a? -3a? /3-a/6+a/3-5/3

=- 10a? April 3, 2004