a) \(210:x=2,1:0,25=8,4\)

\(x=210:8,4=25\)

b) \(x.2+x.0,5=6,25\)

\(2,5x=6,25\)

\(x=6,25:2,5=2,5\)

c) \(x:0,25-x=15,6\)

\(3x=15,6\)

\(x=5,2\)

d) \(x:12,5=3,75.4=15\)

\(x=15.12,5=187,5\)

e) \(x.12,6-x.5,6=42\)

\(7x=42\)

\(x=6\)

g) \(x:0,1-x:4-x.0,75=2,25\)

\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)

\(9x=2,25\)

\(x=0,25\)

giúp mình gấp mn

0,25x + x = 3,75

=> 1,25x = 3,75

=> x = 3,75 : 1,25

=> x = 3

x:4+x=3,75

=> 0,25x+x=3,75

=>1,25x=3,75

=>x=3,75:1,25

=>x=3

Vậy x=3

\(x\) : 4+ \(x\)     = 3,75

\(x\)x 0,25 + \(x\)=3,75

\(x\)x( 1 + 0.25) = 3,75

\(x\)x 1,25          = 3,75

\(x\)                   = 3,75 : 1,25

\(x\)                  = 3

x : 4 + x = 3,75

x/4 + x = 3,75

x/4 + x/1 = 3,75

x/4 + x nhân 4/ 4 = 3,75

x nhân 5/ 4 = 3,75

x nhân 5 = 3,75 x 4

x nhân 5 = 15

x = 15 : 5

x = 3

mn tl hộ e 5p' nữa e phải nộp r

thanks mn nhiều

3.75 : \(\dfrac{1}{4}\) + 3.75 : 0.5 + 3,75 + \(\dfrac{1}{8}\)  + 3,75 x 86

= 3,75 : \(\left(\dfrac{1}{4}+0.5+\dfrac{1}{8}\right)\) + 3,75 x 86

= 3,75 : \(\dfrac{7}{8}\) + 322.5

= 4,3 + 322.5 = 326,8

tích hộ chị nha

x : 4 + x = 3,75

\(x\)x\(\frac{1}{4}\) + \(x=3,75\)

\(x\)x\(\left(\frac{1}{4}+1\right)=\frac{375}{100}\)

\(x\)x\(\frac{5}{4}=\frac{15}{4}\)

\(x=\frac{15}{4}:\frac{5}{4}\)

\(x=\frac{15}{4}\)x\(\frac{4}{5}\)

\(x=3\)

\(\frac{x}{4}+x=3.75\)

\(x\left(\frac{1}{4}+1\right)=\frac{15}{4}\)

\(x\cdot\frac{5}{4}=\frac{15}{4}\)

\(x=\frac{15}{4}:\frac{5}{4}=3\)

x:4+x=3,75

x/4+x=3,75

x(1/4+1)=3,75

x (5/4)=15/4

x=15/4x4/5

x=3

X = 3 nha!

\(a.7,5\times x+x\times3,5=39,93\)

\(\Rightarrow x\times\left(7,5+3,5\right)=39,93\)

\(\Rightarrow x\times11=39,93\)

\(\Rightarrow x=39,93:11\)

\(\Rightarrow x=3,63\)

\(b.x:4+x=3,75\)

\(\Rightarrow x:\frac{4}{1}+x=3,75\)

\(\Rightarrow x\times\frac{1}{4}+x=3,75\)

\(\Rightarrow x\times\left(\frac{1}{4}+1\right)=3,75\)

\(\Rightarrow x\times1,25=3,75\)

\(\Rightarrow x=3,75:1,25\)

\(\Rightarrow x=3\)

a) 7,5 *x + x*3,5=39,93

(7,5 + 3,5) * x=39,93

11 * x = 39,93

x= 39,93 : 11

x= 3,63

b)x : 4 + x=3,75

x * 1/4 + x *1 =3,75

x * (1/4 + 1) = 3,75

x * 5/4 = 3,75

x = 3,75 : 5/4

x= 3