求证:a²+b²≥ab+a+b-1
a²+b²-ab+-a-b+1怎么又等于1/2(a²-2ab+b²)+1/2(a²-2a+1)+1/2(b²-...
a²+b²-ab+-a-b+1
怎么又等于1/2(a²-2ab+b²)+1/2(a²-2a+1)+1/2(b²-2b+1) 呢? 展开
怎么又等于1/2(a²-2ab+b²)+1/2(a²-2a+1)+1/2(b²-2b+1) 呢? 展开
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