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(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2.................999 x 2 x 2 x 2 ?
A.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 > 999 x 2 x 2 x 2 = 9990 > 7992
B.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 < 999 x 2 x 2 x 2 = 9990 < 7992
C.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 = 999 x 2 x 2 x 2 = 9990 = 7992
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222 + 222 = 444
444 - 44 = 400
555 - 45 = 510
345 - 45 = 300
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\(333^{444}=\left(333^4\right)^{111}\)
\(444^{333}=\left(444^3\right)^{111}\)
Ta thấy : \(333^{444}\)và \(444^{333}\)có cùng mũ là \(111\)
=> \(333^4=\left(3\times111\right)^4=3^4\times111^4=81\times111^4\)
\(444^3=\left(4\times111\right)^3=4^3\times111^3=64\times111^3\)
Ta thấy: \(81>64\)
Vậy => \(333^4>444^3\)
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222+444 = 666
=666
câu này đơn giản