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Lời giải:
$x:0,1+x:0,5-x:25\text{%}+x+x=2019$
$x\times 10+x\times 2-x\times 4+x+x=2019$
$x\times (10+2-4+1+1)=2019$
$x\times 10=2019$
$x=2019:10=201,9$
Đáp án A.
\(x:0,1+x:0,5-x:25\%+x+x=2019\)
\(\Rightarrow10x+2x-x:0,25+2x=2019\)
\(\Rightarrow12x-4x+2x=2019\)
\(\Rightarrow10x=2019\)
\(\Rightarrow x=201,9\)
x : 0,1 + x : 0,5 - x : 25 % + x + x = 2019 (dấu chấm lầ dấu nhân)
x . 10 + x . 2 - x : 0,25 + x + x = 2019
x . 10 + x . 2 - x . 4 + x + x = 2019
x . ( 10 + 2 - 4 + 1 + 1 ) = 2019
x . 10 = 2019
x = 2019 : 10
x = 201,9
Vậy x = 201,9
`a)2019xx85+2019xx25-2019xx10`
`=2019xx(85+25-10)`
`=2019xx100=20190`
__________________________________________________
`b)13/5xx4/9+5/9xx13/9`
`=13/9xx4/5+5/9xx13/9`
`=13/9xx(4/5+5/9)`
`=13/9xx61/45=793/405`
Hoặc:
`b)13/5xx4/9+5/9xx13/5`
`=13/5xx(4/9+5/9)`
`=13/5xx9/9=13/5`
\(\dfrac{2020}{2019}-\dfrac{2019}{2018}+\dfrac{1}{2019}x2018\)
\(=\dfrac{2020}{2019}-\dfrac{2019}{2018}+\dfrac{2018}{2019}=2-\dfrac{2019}{2018}=\dfrac{2017}{2018}\)
\(2019\times58+2019\times42+78\)
\(=2019\times\left(58+42\right)+78\)
\(=2019\times100+78\)
\(=201900+78\)
\(=201978\)
tìm x
( X x 0,25 + 2018 ) x 2019 = ( 51 + 2018 ) x 2019
( X x 0,25 + 2018 ) x 2019 = 2069 x 2019
( X x 0,25 + 2018 ) x 2019 = 4177311
X x 0,25 + 2018 = 4177311 : 2019
X x 0,25 + 2018 = 2069
X x 0,25 =2069 - 2018
X x 0,25 = 51
X = 51 : 0,25
X = 204
học tốt ^-^
2019 x 74+ 2019 x 25 + 2019
2019 x 74 + 2019 x 25 + 2019 x 1
2019 x (74 + 25 + 1)
2019 x 100
= 201900
2019 x 74+ 2019 x 25 + 2019=201900