1001 .789 : 1001 +159+258.(502-156)-389.0=..?...
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Tính nhanh
1001 * 789 + 456 * 128 + 912 * 436
1001 . 789 + 456 . 128 + 912 .436 = 1245789
k nha
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Một hình chóp có 1002 đỉnh, hỏi hình chóp đó có bao nhiêu mặt?
A. 1001 B. 501 C. 502 D. 1002
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Ta có:\(1001=1000+1=x+1\)
\(x^8-1001x^7+1001x^6+...+1001x^2-1001x+250\\ =x^8-\left(x+1\right)x^7+\left(x+1\right)x^6+...+\left(x+1\right)x^2-\left(x+1\right)x\\ =x^8-x^8-x^7+x^7+x^6+...+x^3+x^2-x^2-x+250\\ =-x+250=-1000+250\\ =-750\)
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\(1001=77\cdot13\)
\(1001=91\cdot11\)
\(1001=143\cdot7\)
hok tốt
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Tổng A có 1000 số hạng
A>(1001/1000^2+1000)*1000=1001*1000/1000*(1000+1)=1
A<(1001/1000^2)*1000=1001/1000=1+1/1000<1
Vậy 1<A<2 nên 1<A^2<4
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\(A=\frac{1001^{1001}}{1002^{1002}}=\frac{1001^{1000}.1001}{1002^{1001}.1002}\)
\(B=\frac{1001^{1001}+101101}{1002^{1002}+101202}=\frac{1001.1001^{1000}+1001.101}{1002.1002^{1001}+1002.101}\)
\(=\frac{1001\left(1001^{1000}+101\right)}{1002\left(1002^{1001}+101\right)}\)
Xét \(\frac{1001^{1000}+101}{1002^{1001}+101}\)\(-\frac{1001^{1000}}{1002^{1001}}\)
\(=\frac{1002^{1001}\left(1001^{1000}+101\right)-1001^{1000}\left(1002^{1001}+101\right)}{\left(1002^{1001}+101\right).1002^{1001}}\)
\(=\frac{1002^{1001}.1001^{1000}+1002^{1001}.101-1001^{1000}.1002^{1001}-1001^{1000}.101}{\left(1002^{1001}+101\right).1002^{1001}}\)
\(=\frac{101\left(1002^{1001}-1001^{1000}\right)}{\left(1002^{1001}+101\right).1002^{1001}}>0\)
=> \(\frac{1001^{1000}+101}{1002^{1001}+101}\)\(>\frac{1001^{1000}}{1002^{1001}}\)
=> \(\frac{1001\left(1001^{1000}+101\right)}{1002\left(1002^{1001}+101\right)}>\frac{1001^{1000}.1001}{1002^{1001}.1002}\)
=> \(B>A\)