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2020 x 0,56 + 0,36 x 6060 + 8080 x 0,85 + 2020 x 5,02
=1131,2+2181,6+6868+10140,4
=20321,2
2020 x 0,56 +0,36x6060+8080x0,85+2020x5,02
=2020 x 0,56 +0,36x3x2020+4x2020x0,85+2020x5,02
=2020 x 0,56 +1,08x2020+3,4x2020+2020x5,02
=2020x(0,56+1,08+3,4+5,02)
= 2020x10,06
=20321.2
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
\(x\times2020-x=2020\times2018+2020\)
\(\Rightarrow x\times\left(2020-1\right)=2020\times\left(2018+1\right)\)
\(\Rightarrow x\times2019=2020\times2019\)
\(\Rightarrow x=2020\)
x * 2020 - x = 2020 * 2018 + 2020
x * 2020 - x * 1 = 2020 * 2018 + 2020 * 1
x * ( 2020 - 1) = 2020 * (2018 + 1)
x * 2019 = 2020 * 2019
Vậy x = 2020
a ) Tìm x:
X x 2 – 5,767 = 200 – 13,2
X x 2 - 5,767 = 186,8
X x 2 = 186,8 + 5,767
X x 2 = 192.567
X = 192.567 : 2
X = 96.2835 .
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
= 2020 x 0,56 + 0,34 x 3 x 2020 + 2020 x 4 x 0,85 + 2020 x 5,02
= 2020 x 0,56 + 1,02 x 2020 + 2020 x 3,4 + 2020 x 5,02
= 2020 x ( 0,56 + 1,02 + 3,4 + 5,02 )
= 2020 x ( 1,58 + 3,4 + 5,02 )
= 2020 x ( 4,98 + 5,02 )
= 2020 x 10
= 20202
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Tính theo tính nhanh_________