为什么(a²+b²)/2-ab=(a²-2ab+b²)/2
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为什么(a²+b²)/2-ab=(a²-2ab+b²)/2
为什么(a²+b²)/2-ab=(a²-2ab+b²)/2
为什么(a²+b²)/2-ab=(a²-2ab+b²)/2
(a²+b²)÷2-ab
=(a²+b²)÷2-2ab÷2
=(a²+b²-2ab)÷2
=(a²-2ab+b²)/2