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( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x ( 1 + 1/3 - 4/3)
=( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x ( 4/3 - 4/3)
=( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x 0
=0
Ta có: \(\left(2013\cdot2014+2014\cdot2015+2015\cdot2016\right)\left(1+\dfrac{1}{3}-\dfrac{4}{3}\right)\)
\(=\left(2013\cdot2014+2014\cdot2015+2015\cdot2016\right)\left(\dfrac{3}{3}+\dfrac{1}{3}-\dfrac{4}{3}\right)\)
=0
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( 2014 x 2015 - 2016 ) : ( 2012 + 2013 x 2014 )
= ( 4058210 - 2016 ) : ( 2012 + 4054182 )
= 4056194 : 4056194
= 1
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a) 20,8 x 45 + 0,37 x 15 + 20,8 x 55 x 0,63
= 20,8 x ( 45 + 55 x 0,63 ) + 0,37 x 15
= 20,8 x ( 45 + 34,65 ) + 5,55
= 20,8 x 79,65 + 5,55
= 1656,72 + 5,55
= 1662,27
b) ( 2013 x 2014 + 2014 x 2015 + 2015 x 2016 ) x ( 1 + 1/3 - 1 và 1/3 )
= ( 2013 x 2014 + 2014 x 2015 + 2015 x 2016 ) x [( 1 - 1 ) + ( 1/3 - 1/3 ) ]
= ( 2013 x 2014 + 2014 x 2015 + 2015 x 2016 ) x 0
= 0
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a.45.32+45.66+45.2
= 45.(32+66+2)
=45.100=4500
b.(2013+2014+2015).(20+10).12-18.20
=(2013+2014+2015).(30.12-(12+6).20)
=(2013+2014+2015).(30*12-12.20-6.20)
=(2013+2014+2015).(12.(30-20)-6.20)
=(2013+2014+2015).(12.10-6.20)
=(2013+2014+2015).(120-120)
=(2013+2014+2015).0
=0
c.(12+12+12.88).45+12.12
=(12.(1+1+88)).45+12.10
=12.90.45+120
=12.9.10.5.9+120
=1080.5.9+120
=5400.9+120
=48600+120
=48720
nho k cho to nhe
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2014.2015+2016}{2015.2016-2014}=\frac{2014.2015+2016}{2015.2014+4030-2014}=\frac{2014.2015+2016}{2014.2015+2016}=1\)
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\(\frac{2015+2014\cdot2016}{2015\cdot2016-1}\)
\(=\frac{2015+\left(2015-1\right)2016}{2015\cdot2016-1}\)
\(=\frac{2015-2016+2015\cdot2016}{2015\cdot2016-1}\)
\(=\frac{2015\cdot2016-1}{2015\cdot2016-1}\)
\(=1\)
\(\frac{2015\times2014-1}{2013\times2015+2014}=\frac{2015\times2013+\left(2015-1\right)}{2013\times2015+2014}=\frac{2015\times2013+2014}{2015\times2013+2014}=1\)
BẰNG 100000000000000000% LẦN