化简a^2+b^2-1/2a^2-1/2(a+b)*b

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化简a^2+b^2-1/2a^2-1/2(a+b)*b
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化简a^2+b^2-1/2a^2-1/2(a+b)*b
化简a^2+b^2-1/2a^2-1/2(a+b)*b

化简a^2+b^2-1/2a^2-1/2(a+b)*b
原式=a²+b²-1/2a²-1/2ab-1/2b²
=1/2a²-1/2ab+1/2b²