tính bằng cách thuận tiện nhất : 2017+2017x7+2017x2=
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2016 x 101 – 2016
= 2016 x 101 – 2016 x 1
= 2016 x ( 101 -1)
= 2016 x 100
= 201600
\(2017\times2001-2016\times2001-2000\)
\(=2017\times2001-2001-2016\times2000\)
\(=2001\times\left(2017-1\right)-2016\times2000\)
\(=2001\times2016-2016\times2000\)
\(=2016\times\left(2001-2000\right)\)
\(=2016\times1\)
\(=2016\)
2017 x 3 + 2017 x 31 + 2017 x 67 - 2017 = 2017 x ( 3 + 31 + 67 - 1 )
= 2017 x 100
= 201700
tk mk nha
(4,329:0,001-43,29).150+2017-5:10
=(4329-43,29).150+2017-0,5
=4285,71.150+2016,5
=642856,5+2016,5
=644873
\(\frac{2017}{2018}\times2015+\frac{2017}{2018}\times4-\frac{2017}{2018}.\)
\(=\frac{2017}{2018}\times2015+\frac{2017}{2018}\times4-\frac{2017}{2018}\times1\)
\(=\frac{2017}{2018}\times\left(2015+4-1\right)\)
\(=\frac{2017}{2018}\times2018\)
\(=\frac{2017\times2018}{2018\times1}\)
\(=\frac{2017}{1}=2017\)
\(2018\cdot2018-2017\cdot2019\)
\(=2018^2-\left(2018-1\right)\left(2018+1\right)\)
\(=2018^2-\left(2018^2-1\right)\)
\(=2018^2-2018^2+1\)
\(=1\)
\(2018.2018-2017.2019\)
\(=2018^2-\left(2018-1\right)\left(2018+1\right)\)
\(=2018^2-\left(2018^2-1\right)\)
\(=2018^2-2018^2+1\)
\(=1\)
thank
2017+2017 x 7 +2017 x 2
= 2017 x 1 +2017 x 7 + 2017 x 2
=2017 x (1+7+2)
=2017 x 10
=20170