cho a+b\(\ge\)0, chứng minh \(\dfrac{a+b}{2}\)\(\le\)\(\sqrt{\dfrac{a^2+b^2}{2}}\)
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Toán lớp 10
cho a+b\(\ge\)0, chứng minh \(\dfrac{a+b}{2}\)\(\le\)\(\sqrt{\dfrac{a^2+b^2}{2}}\)
