\(\frac{x}{3,75}+\frac{x}{2,5}=3,8\)

\(x.\left(\frac{1}{3,75}+\frac{1}{2,5}\right)=3,8\)

\(x.\frac{2}{3}=3,8\)

\(x=3,8.\frac{3}{2}=5,7\)

\(x:3,75+x:2,5=3,8\)

\(x\times\frac{4}{15}+x\times\frac{2}{5}=3,8\)

\(x\times\left(\frac{4}{15}+\frac{2}{5}\right)=3,8\)

\(x\times\frac{2}{3}=3,8\)

         \(x=3,8:\frac{2}{3}\)

         \(x=5,7\)

x : 3,75 + x : 2,5 = 3,8

x : ( 3,75 + 2,5 ) = 3,8

x : 6,25 = 3,8

x = 3,8 x 6,25

x = 23,75

x * 15,8 + x * 84,2 = 200

x * ( 15,8 + 84,2 ) = 200

x * 100 = 200

x = 200 : 100

x = 2

x:(3,75+2,5)=3,8

x:6,25=3,8

x=3,8 x 6,25

x=23,75

h nhe

11,875

Giúp mình nhanh với!!!!

a) 387*0,25 -(x: 4+x: 0,125): 0,5 = 14,25
 96,75 - (x: 4 + 32x: 4): 0,5 = 14,25
(x: 4 + 32x: 4): 0,5 96,75 - 14,25
(x: 4 + 32x: 4): 0,5 = 82,5
(33x: 4): 0,5 = 82,5
33x4 = 82,5 * 0,5
33x: 441,25
33x = 41,25 * 4

b) (2,5*1,2 + x - 2,5): 2,5 = 4
2,5*1,2x-2,5 = 4*2,5
2,5*1,2+x-2,5 = 10
3+x-2,5 = 10
3 + x = 10 + 2,5
3+ x = 12,5
 x = 12,5 - 3
 x = 9,5

c \()\)1,2x(3,75-0,75:x-0,5)=3,6
3,75-0,75:x-0,5=3,6:1,2
3,75-0,75:x-0,5=3
0,75:x-0,5-3,75-3
0,75:x-0,5=0,75
0,75:x=0,75+0,5
0,75:x=1,25
X=0,75:1,25
x=0,6

g)1,25 x 6,54 x 8

=(1,25 x 8) x 6,54

=10 x 6,54

=65,4

\(\dfrac{3,75}{x}=\dfrac{4,8}{2,5}\)

<=> 3,75 . 2,5 = 4,8x

<=> 9,375 = 4,8x

<=> x = \(\dfrac{9,375}{4,8}=\dfrac{125}{64}\)

\(3,75:x=4,8:2,5\)

\(3,75:x=1,92\)

\(x=3,75:1,92\)

\(x\approx1,95\)

\(2,5x+9=3,75x-13,5\)

\(\Rightarrow3,75x-2,5x=9+13,5\)

\(\Rightarrow1,25x=22,5\)

\(\Rightarrow x=18\)

Bài làm:

Ta có: \(x.2,5+9=x.3,75-13,5\)

\(\Leftrightarrow\frac{5}{2}x+9=\frac{15}{4}x-13,5\)

\(\Leftrightarrow\frac{15}{4}x-\frac{5}{2}x=13,5+9\)

\(\Leftrightarrow\frac{5}{4}x=\frac{45}{2}\)

\(\Leftrightarrow x=\frac{45}{2}\div\frac{5}{4}\)

\(\Rightarrow x=18\)

Đề bài j kì zịa?

(x-1,3)+(x+2,5)+(x-3,8)=1,9

viết thiếu hihi

`a)34,3+9,65xx2,4-3,8`

`=34,3+23,16-3,8`

`=57,46-3,8`

`=53,66`

`b)2,5xx5,5xx2,4`

`=13,75xx2,4`

`=33`

a)

\(34,3+9,65\times2,4-3,8\)

\(= 34,3 + 23,16 - 3,8 \)

\(=57,46-3,8\)

\(=53,66\)

b)

\(2,5\times5,5\times2,4\)

\(=13,75\times2,4\)

\(=33\)