x,y∈R.x+y=1 求证(x+2²+(y+2)²≥25/2
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x,y∈R.x+y=1 求证(x+2²+(y+2)²≥25/2
x,y∈R.x+y=1 求证(x+2²+(y+2)²≥25/2
x,y∈R.x+y=1 求证(x+2²+(y+2)²≥25/2
数形结合!
用柯西不等式证明
今天知道都是啥人给解答?
x,y∈R x²+y²≥2xy 2x²+2y²≥x²+2xy+y²=﹙x+y﹚²
﹙x+2﹚²+﹙y+2﹚²≥﹙x+y+4﹚²/2=25/2