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2016*20152015-2015*20162016
=2016 * 2015 * 10001 -2016 * 2015 * 10001
=0
a ) ( 1978 x 1979 + 1980 x 21 + 1958 ) / ( 1980 x 1979 - 1978 x 1979 ) = 1978 x 1979 + 1980 / 1979 . ( 1980 - 1978 )
= 0/1979
\(\frac{2016x125+1000}{126x2015-880}\)
\(=\frac{2015x125+125+1000}{125x2015+2015-880}\)
\(=\frac{2015x125+1125}{125x2015+1135}=\frac{2015x125+1135-10}{125x2015+1135}\)
\(=1-\frac{10}{125x2015+1135}\)
bn cs chép nhầm đề ko z?
\(\left(5\times6+11-41\right)\times\left(1+2+3+\cdot\cdot\cdot+100\right)\)
\(=\left(30+11-41\right)\times\left(1+2+\cdot\cdot\cdot+100\right)\)
\(=\left(41-41\right)\times\left(1+2+\cdot\cdot\cdot+100\right)\)
\(=0\times\left(1+2+\cdot\cdot\cdot+100\right)\)
\(=0\)
\(\left(2+4+\cdot\cdot\cdot+100\right)\times\left(11\times7-78+1\right)\)
\(=\left(2+4+\cdot\cdot\cdot+100\right)\times\left(77+1-78\right)\)
\(=\left(2+4+\cdot\cdot\cdot+100\right)\times0\)
\(=0\)
a/
\(\dfrac{4}{15}=1-\dfrac{11}{15}\)
\(\dfrac{5}{16}=1-\dfrac{11}{16}\)
\(\dfrac{11}{15}>\dfrac{11}{16}\Rightarrow1-\dfrac{11}{15}< 1-\dfrac{11}{16}\Rightarrow\dfrac{4}{15}< \dfrac{5}{16}\)
b/
\(\dfrac{2}{113}=\dfrac{4}{226}< \dfrac{4}{115}\)
c/ \(\dfrac{2}{7}=\dfrac{4}{14}< \dfrac{4}{9}\)
d/ \(\dfrac{2}{5}=\dfrac{4}{10}< \dfrac{4}{7}\)
a,\(\dfrac{4}{15}< \dfrac{5}{16}\)
b,\(\dfrac{2}{113}< \dfrac{4}{115}\)
c,\(\dfrac{2}{7}< \dfrac{4}{9}\)
d,\(\dfrac{4}{7}>\dfrac{2}{5}\)
20162016 x 2017 - 20172017 x 2016 = 2016 x 10001 x 2017 - 2017 x 10001 x 2016
= 0
\(\frac{2015}{2016}×\frac{20162016}{19451945}×\frac{194519451945}{201520152015}\)
\(=\frac{2015}{2016}×\frac{2016}{1945}×\frac{1945}{2015}\)
\(=\frac{2015×2016×1945}{2016×1945×2015}\)
\(=\frac{2015×2016×1945}{2015×2016×1945}\)
\(=1\)