a2+b2-1/2a2-1/2(a+b)*b怎么化简
1个回答
a2+b2-1/2a2-1/2(a+b)*b
=a^2+b^2-1/2a^2-1/2ab-1/2b^2
=1/2a^2+1/2b^2-1/2a
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