X: 0.1 + X : 0.5 - X : 25% + X + X = 2019
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X+ 0,1+X+0,2+...+X+0,5=5,55
<=> 5x X + (0,5+0,1) x 5 :2 = 5,55
<=> 5 x X + 1,5 = 5,55
<=> 5 x X= 5,55- 1,5
<=> 5 x X= 4,05
<=>X= 4,05:5
<=>X=0,81
( 11 x 9 - 900 x 0.1- 8) x ( 56.7 x 0.5 + 56.7 x 9.5)
=(99 - 90 - 8) x [56.7(0.5+9.5)]
=1 x [56.7x10]
=1x 567=567
( 11 x 9 - 900 x 0.1- 8) x ( 56.7 x 0.5 + 56.7 x 9.5)
=(99 - 90 - 8) x [56.7(0.5+9.5)]
=1 x [56.7x10]
=1x 567=567
\(a.7,15:0,5+7,15.9-7,15=7,15.\left(2+1-1\right)\)
\(=7,15.10=71,5.\)
\(b.3,14:0,1+75\%.3,14+3,14:0,125+81,25.3,14=3,14.\left(10+\frac{3}{4}+8+81,25\right)\)
\(=3,14.100=314.\)
7.15*2+7.15*9-7.15
7.15*(2+9-1)
7.15*10
71.5
b, 3.14*10+7.5*3.14+3.14*8+81.25*3.14
=314*(10+7.5+8+81.25)
=3.14*106.75
=355.195
\(\frac{x}{10}\)^2019+(0,1)^2019=\(\frac{1}{10}\)^2019 \(\frac{x}{10}\)^2019 =(0,1)^2019-(0,1)^2019 \(\frac{x}{10}\)^2019 =0 \(\frac{x}{10}\)^2019 =0^2019 \(\frac{x}{10}\) =0 x =0
\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)
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
\(x:0,1+x:0,5-x:25\%+x+x=2019\)
\(\Rightarrow10x+2x-x:0,25+2x=2019\)
\(\Rightarrow12x-4x+2x=2019\)
\(\Rightarrow10x=2019\)
\(\Rightarrow x=201,9\)
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