simplify using suitable identity
1/2 a + b - c
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- associative property is suitable for this question
- a=1/2a
- b=b
- c=-c
- a×(b×c)=(a×b)×c
- 1/2a×(b×-c)=(1/2a×b)×(-c)
- -1/2abc=-1/2abc
- this question satisfies associative property
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