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2021x0.5+2021x1%-2021:2
=2021x0.5+2021x0.01-2021x0.5
=2021x(0.5+0.01-0.5)
=2021x 0.01
=20,21
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\(A=2018\times2020+2021\) và \(B=2019\times2019+2021\)
\(A=2018\times2019+2018+2021\)
\(B=2018\times2019+2019+2021\)
Vì \(2019>2018\Rightarrow A< B\)
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a) = 1,7 x 46 + 1,7 x 60 + 1,7 x 94
= 1,7( 46 + 60 + 94 )
= 1,7 x 200 = 340
b) 202,1 x 3,6 +202,1 x6,3 +2021 : 100
= 202,1 x 3,6 + 202,1 x 6,3 + 20,1
= 202,1 x ( 3,6 + 6,3 + 0,1 )
= 202,1 x 10
=2021
c)20,21 x 48 + 20,21 x 51 + 2021 : 100
= 20,21 x 48 + 20,21 x51 + 20,21
= 20,21 (48+51+1)
= 2021
HAPPY NEW YEAR !!!
Chúc bạn hok tốt :3
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B=2021 x 13 + 2009 + 2020 x 2007/2020 + 2020 x520x2020
B=2021 x 13 +2009+2020/1x2007/2020 +2020x520x2020
B=26273+2009+20201/1x2007/20201+2121808000
B=28282+2007+2121808000
B=2121838289
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\(=2021\cdot2\cdot\left(1+\dfrac{1}{2}:\dfrac{3}{2}-\dfrac{4}{3}\right)=4042\cdot\left(1+\dfrac{1}{3}-\dfrac{4}{3}\right)=0\)
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2021 x 2021 - 2019 x 2023
= (2019 +2) x ( 2023 -2) - 2019 x 2023
= 2019 x 2023 - 2 x 2019 + 2 x 2023 - 4 - 2019 x 2023
= ( 2019 x 2023 - 2019 x 2023) + 2 x ( 2023 - 2019) - 4
= 0 + 2 x 4 - 4
= 8 - 4
= 4
2021 x 2021 - 2019 x 2023
= (2019 +2) x ( 2023 -2) - 2019 x 2023
= 2019 x 2023 - 2 x 2019 + 2 x 2023 - 4 - 2019 x 2023
= ( 2019 x 2023 - 2019 x 2023) + 2 x ( 2023 - 2019) - 4
= 0 + 2 x 4 - 4
= 8 - 4
= 4
2002/3000. Đúng 100%