1.
a,\(\left(2013\times2014+2014\times2015+2015\times2016\right)\times\left(1+\frac{1}{3}-1\frac{1}{3}\right)\)
\(=\left(2013\times2014+2014\times2015+2015\times2016\right)\times\left(1\frac{1}{3}-1\frac{1}{3}\right)\)
\(=\left(2013\times2014+2014\times2015+2015\times2016\right)\times0\)
\(=0\)
b, \(17,75+16,25+14,75+13,25+...+4,25+2,75+1,25\)
\(=\left(17,75+1,25\right)+\left(16,25+2,75\right)+...+9,75\)
\(=19\times7+9,75\)
\(=142,75\)
Hok Tốt!!!!
\(a,\left(2013×2014+2014×2015+2015×2016\right)×\left(1+\frac{1}{3}-1\frac{1}{3}\right)\)
\(=A×\left(1+\frac{1}{3}-\frac{4}{3}\right)\)
\(=A×\left(\frac{4}{3}-\frac{4}{3}\right)\)
\(=A×0\)
\(=0\)
1a. (2013*2014+2014*2015+2015*2016) * \(\left(1+\frac{1}{3}-1\frac{1}{3}\right)\)
= (2013*2014+2014*2015+2015*2016) * 0
= 0
b. 17,75 + 16,25 + 14,75 + 13,25 + ... + 4,25 + 2, 75 + 1,25
= (17,75+1,25) + (16,25+2,75)+... + 9,75
= 19 x 7 + 9,75
= 142,75
