A = \sprt{6+2 \sprt{2}. \sprt{3 + \sprt{4+2 \sprt{3}}}
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\(1=\left(a+b\right)\left[\left(a+b\right)^2-3ab\right]\ge\left(a+b\right)\left[\left(a+b\right)^2-\frac{3}{4}\left(a+b\right)^2\right]=\frac{\left(a+b\right)^3}{4}\)
\(\Rightarrow\left(a+b\right)^3\le4\Rightarrow a+b\le\sqrt[3]{4}\)
\(A=\sqrt{a}+\sqrt{b}\le\sqrt{2\left(a+b\right)}\le\sqrt{2\sqrt[3]{4}}\)
\("="\Leftrightarrow a=b=\frac{1}{\sqrt[3]{2}}\)
a: \(=\sqrt{17^2\cdot21}=17\sqrt{21}\)
b: \(=\sqrt{2.5\cdot2.5\cdot5\cdot20}=2.5\cdot10=25\)
a) (a2+c2)2
b) \(\dfrac{PI.R1^2-PI.R2^2}{4}\)
c)\(\sqrt{p.\left(p-a\right).\left(p-b\right)\left(p-c\right)}\)
chúc bạn học tốt!!
1. Quebec wanted some from of .....separation.....from the rest of Canada.(separate)
2.The list of their achievements is pretty ....impressive...... . (impress)
3. She felt alone and .....friendless........(friend)
4. Island is one of the great world.....religions........(religious)
5. We need to get more young people ....interested....... in the sprt (interest)
a,M=2^0-2^1+2^2-2^3+2^4-2^5+.....+2^2012
2M=2^1-2^2+2^3-2^4+2^5-2^5+......-2^2012+2^2013
3M=2^0+2^2013
M=(2^0+2^2013)÷3
Vậy.......
b,N=3-3^2+3^3-3^4+3^5-3^6+.....+3^2011-3^2012
3N=3^2-3^3+3^4-3^5+3^6-3^7+......+3^2012-3^2013
4N=3-3^2013
N=(3-3^2013)÷4
Vậy........
K tao nhé ko lên lớp tao đánh m😈😈😈