1/2(a+b)+1/2(a-b)化简
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1/2(a+b)+1/2(a-b)化简1/2(a+b)+1/2(a-b)化简1/2(a+b)+1/2(a-b)化简1/2(a+b)+1/2(a-b)=1/2(a+b+a-b)=1/2(2a)=a
1/2(a+b)+1/2(a-b)化简
1/2(a+b)+1/2(a-b)化简
1/2(a+b)+1/2(a-b)化简
1/2(a+b)+1/2(a-b)
=1/2(a+b+a-b)
=1/2(2a)
=a