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= 11 x 11 + 11 x 12 + 11 x 13 + 25 x 11 = 11 x (11 + 12 + 13 + 25) = 11 x 61
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143 + 187 + 209
= 11 x (13 + 17 + 20)
= 11 x 40
LIK-E mik nha bạn
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\(A=132+77+198=12.11+7.11+18.11=37.11\)
\(B=5555+6767+7878=55.101+67.101+78.101=200.101\)
\(C=1997,1997+1998,1998+1999,1999\)
\(=1997\times1,0001+1998\times1,0001+1999\times1,0001\)
\(=5994\times1,0001\)
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a) 144 + 77 + 143 = 264 \(⋮\)11
b) 132 - 55 = 77 \(⋮\)11
c) 143 + 99 + 12 = 254 \(⋮̸\)11
d) 243 - 89 =154 \(⋮\)11
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\(=4^{1010}\cdot125^{673}\\ =4^{337}\cdot4^{673}\cdot125^{673}\\ =4^{337}\cdot500^{673}\\=2^{674} \cdot500^{673}\\ =2\cdot2^{673}\cdot500^{673}\\ =2\cdot1000^{673}=200000...000\left(Có.2019.số.0\right)\\ Vậy.tổng.chữ.số.là=2+0\cdot2019=0\)
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