8,24:0,25-4x6,24+2021

=8,24x4-4x8,24+2021

=8,24x(4-4)+2021

=8,24x0+2021

=0+2021

=2021

8,24:0,25-4x6,24+2021

=8,24x4-4x8,24+2021

=8,24x(4-4)+2021

=8,24x0+2021

=0+2021

=2021

\(5x+7,3=54,7\\ \Rightarrow5x=54,7-7,3\\ \Leftrightarrow5x=47,4\\ \Leftrightarrow x=47,4:5=\dfrac{237}{25}\)

Vậy \(x=\dfrac{237}{25}\)

\(x\times78,3=54+375,36\\ \Leftrightarrow x\times78,3=429,36\\ \Leftrightarrow x=429,36:78,3\\ \Leftrightarrow x=\dfrac{7156}{1305}\)

Vậy \(x=\dfrac{7156}{1305}\)

... lỗi số rồi

:v?

8,24 x X + 91,76 x X = 50%      

X x ( 91,76 + 8,24) = 50%

X x 100 = 50%

X x 100= 1/2

X = 1/2 : 100

X = 1/200

= 4,3x(8,24+6,37-4,61)

= 4,3x10,36

=44,548

cho mình 1 tích nha

số lớn nhất có 3 chữ số là 999

12+1+78,2-x=999

13+78,2-x=999

91,2-x=999

x=91,2-999

x=-907,8

Số lớn nhất có 3 chữ số : 999

Ta có : 12+1+78,2-x=999

          =91,2-x=999

          =999-91,2=907,8

Li-ke cho mik nhé!

\(=4,3\times\left(8,24-4,61+1\right)+6,37\\ =4,3\times4,63+6,37\\ =19,909+6,37\\ =26,279\)

=4,3×(8,24−4,61+1)+6,37=4,3×4,63+6,37=19,909+6,37=26,279

$=4,3\times \left(8,24-4,61+1\right)+6,37=4,3\times 4,63+6,37=19,909+6,37=26,279$

a, 12,6 – 7,859 = 4,471

b, 26,85 + 1,76 + 0,9 = 29,51

c, 78,2 x 5,84 = 456,688

d, 455 : 7,28 = 62,5

Bài 2: 

a: 5x+7,3=54,7

=>5x=47,4

hay x=9,48

b: 78,2x=54+375,36=429,36

nên x=10734/1955

c: 155,7-x=2,3x5

=>155,7-x=11,5

hay x=144,2

Gọi $n_{CH_3COOC_2H_5} = a(mol) ; n_{CH_3COOCH_3} = b(mol)$
$\Rightarrow 88a + 74b = 8,24(1)$
Ta có : 

$n_{CH_3COOH} = a + b = \dfrac{6}{60} = 0,1(2)$

Từ (1)(2) suy ra a = 0,06 ; b = 0,04

$m_{CH_3COOCH_3} = 0,04.74 = 2,96(gam)$