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1-1/2+1/3-1/4+1/5-1/6+...+1/2011-1/2012 / 1006-1006/1007-1007/1008-1008/1009-...-2010/2011-2011/2012
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\(B=\frac{2006\cdot125+1000}{126\cdot2005-880}\)
= \(\frac{2005\cdot125+125+1000}{2005\cdot126-880}=\frac{2005\cdot125+1125}{2005\cdot126-880}\)
=\(\frac{2005\cdot125+1125}{2005\cdot125+125-880}=1,007523912\)
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\(\frac{2016x125+1000}{126x2015-880}\)
\(=\frac{2015x125+125+1000}{125x2015+2015-880}\)
\(=\frac{2015x125+1125}{125x2015+1135}=\frac{2015x125+1135-10}{125x2015+1135}\)
\(=1-\frac{10}{125x2015+1135}\)
bn cs chép nhầm đề ko z?
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A = 20,12 x 56,764 + 20,12 x 43,236
= 20,12 x ( 56,764 + 43,236)
= 20,12 x 100 = 2012
mk chỉ giải A thôi vì mình ko có nhìu thời gian.
\(B=\frac{2012\times125+1000}{126\times2011-880}\)
\(=\frac{2005\times125+125+1000}{125\times2005+2005-880}\)
\(=\frac{2005\times125+1125}{125\times2055+1125}\)
\(=1\)
\(B=\frac{2012\times125+1006}{126\times2011-880}=\frac{\left(2011+1\right)\times125+1006}{\left(125+1\right)\times2011-880}\)
\(=\frac{2011\times125+125+1006}{125\times2011+2011-880}=\frac{2011\times125+1131}{125\times2011+1131}=1\)