\(y:0,25+y:0,2+y=2019\)

\(y\times4+y\times5+y=2019\)

\(y\times\left(4+5+1\right)=2019\)

\(y\times10=2019\)

\(y=2019:10\)

\(y=201,9\)

\(y:\dfrac{1}{4}+y:\dfrac{1}{5}+y=2019\)

\(4xy+5xy+y=2019\)

\(10xy=2019\Rightarrow y=2019:10=201,9\)

y : 0,25 + y: 0,2 + y = 2019

y \(\times\) 4 + y  \(\times\) 5 + y = 2019

y \(\times\) ( 4 + 5 + 1) = 2019

y \(\times\) 10 = 2019

y = 2019 : 10

y = 201,9 

44.9

=44,9

44.9

= 820 nha. hihi. k mk nha

820 nha

132 : ( 0,125 + 0,25 - 0,2 + 0,5 + 1) 

= 132 : 1,675 

= 78,80

    132: 0,125 + 132: 0,25 - 132: 0,2 + 132: 0,5 + 132

= 132 \(\times\) 8 + 132 \(\times\) 4 - 132 \(\times\) 5 + 132 \(\times\) 2 + 132 \(\times\) 1

= 132 \(\times\) ( 8 + 4 - 5 + 2 + 1)

= 132 \(\times\) ( 12 - 5 + 3)

= 132 \(\times\) ( 7 + 3)

= 132 \(\times\) 10

= 1320

X + X : 0,1 + X : 0,2 + X : 0,25 = 192

X + X x 10 + X x 5 + X x 4 = 192

X x (10 + 5 + 4) = 192

X x 19 = 192

X = 192 : 19

X = 192/19

X+X:0.1+X:0.2+X:0.25=192

X+X:1/10+X:1/5+X:1/4=192

X+X*10+X*5+X*4=192

X*(1+5+4+10)=192

X*20=192

X=192:20

X=9.6

\(x+\frac{x}{0.1}+\frac{x}{0.2}+\frac{x}{0.25}=192\)

\(\Leftrightarrow x+\frac{x}{\frac{1}{10}}+\frac{x}{\frac{2}{10}}+\frac{x}{\frac{25}{100}}=192\)

\(\Leftrightarrow x+10x+5x+4x=192\)

\(\Leftrightarrow20x=192\)

\(\Leftrightarrow x=\frac{192}{20}=\frac{48}{5}\)

x:0,25+x+x:0,2=120

x*4+x*1+x*5=120

x*(4+1+5)=120

x*10=120

x=120:10

x=10

*=nhân 

thanhs linh

này linh phải bằng 12 chứ

45*73+45*26+45

=45*[73+26+1]

=45*100

=4500

`=44,9`

150 - 40 × 20 × 5 × 0.5 × 0.25 × 0.2 - 5 - 0.1

150 - (40 . 20 . 5 . 0,5 . 0,25 . 0,2) - 5 - 0,1

150 - 100 - 5 - 0,1 

Đáp án :44,9