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\(=\dfrac{2019\cdot2020\left(2020\cdot10001-2019\cdot10001\right)}{2020\cdot2019\cdot2018\cdot10001}=\dfrac{10001\cdot1}{10001\cdot2018}=\dfrac{1}{2018}\)
2020 x 2021 - 3031 = 2020 x ( 2 + 2019 ) - 3031 = 2020 x 2019 + 2020 x 2 - 3031 = 2019 x 2020 + 1009
Nên ( 2019 x 2020 + 1009 ) : ( 2020 x 2021 - 3031 ) = ( 2019 x 2020 + 1009 ):( 2019 x 2020 + 1009 )=1
\(A=\frac{2}{2018\times2020}+\frac{2021}{2020}-\frac{2019}{2018}\)
\(A=\frac{2020-2018}{2018\times2020}+\frac{2021}{2020}-\frac{2019}{2018}\)
\(A=\frac{1}{2018}-\frac{1}{2020}+\frac{2021}{2020}-\frac{2019}{2018}\)
\(A=\left(\frac{2021}{2020}-\frac{1}{2020}\right)-\left(\frac{2019}{2018}-\frac{1}{2018}\right)\)
\(A=1-1=0\)
\(13,25:0,5+13,25:0,2+13,25:0,25\\ =13,25\times2+13,25\times5+13,25\times4\\ =13,25\times\left(2+5+4\right)\\ =13,25\times11\\ =145,75\)
13,25 : 0,5 + 13,25 : 0,2 + 13,25 : 0,25
= 13,25 \(\times\) 2 + 13,25 \(\times\) 5 + 13,25 \(\times\) 4
= 13,25 \(\times\) 2 + 13,25 \(\times\) 5 + 13,25 \(\times\) 3 + 13,25
= 13,25 \(\times\) ( 2 + 5 + 3) + 13,25
= 13,25 x 10 + 13,25
= 132,5 + 13,25
= 145,75
\(2020:0,2+2020+2020:0,25\)
\(=2020:\dfrac{1}{5}+2020+2020:\dfrac{1}{4}\)
\(=2020\times5+2020+2020\times4\)
\(=2020\times \left(5+1+4\right)\)
\(=2020\times10\)
\(=20200\)