a/ x+65,27=72,6

    x=72,6-65,27

     x=7,33

b/x-43,502=21,73

            x=21,73+43,502

              x=65,232

c/x.6,3=187

           x=187:6,3

           x=29,682....

d/ 1602:x=7,2

           x=1602:7,2

           x=222,5

\(X+65,27=72,6\\ X=72,6-65,27=7,33\\ ---\\ X-43,502=21,73\\ X=21,73+43,502=65,232\\ ---\\ X.6,3=187\\ X=\dfrac{187}{6,3}=\dfrac{1870}{63}\\ ---\\ 1602:X=7,2\\ X=1602:7,2=222,5\)

x+ 65,27=72,6

x = 72,6 - 65,27 

x = 7,33

x-43,502=21,73

x = 21,73 + 43,502 

x = 65,232

 x = 72,6 - 65,27 = 7,33

x = 21,73 + 43,502 = 65,232

x+ 65,27=72,6

x           = 72,6 - 65,27

x             =   7,33

x-43,502=21,73

x            = 21,73  + 43,502

x            = 65,232

ai nhanh ho tui c

x x là sao????

là chia

a) x + 65,27 = 72,6

=> x = 72,6 - 65,27

=> x = 7,33

b) x * 6,3 = 187

=> x = 187 : 6,3

=> x = 187/6,3

c) 1602 : x = 7,2

=> x = 1602 : 7,2

=> x = 222,5

a,x+65,27=72,6

x=72,6-65,27

x=7,33

b,x.6,3=187

x=187:6,3

x=\(\frac{1870}{63}\)

c,1602:x=7,2

x=1602:7,2

x=\(\frac{445}{2}\)

chúc bạn học tốt!

a.\(x+65,27=72,6\)   

\(x=72,6-65,27\)        

\(x=7,33\)     

Học tốt   -_-                

x(100%+20%)=7.2

x120%=720%

x=720%:120%

x=6

vậy////////

(40%+100%)x+20%=720%

140%x=720%-20%

140%x=700%

x=720%:140%

x=36/7

vậy x=/////////////

x﴾100%+20%﴿

=7.2 x120%

=720% x

=720%:120%

x=6 

x+20%*x=7,2

x(20%+1)=7,2

x(1/5+1)=7,2

x*6/5=7,2

x*1,2=7,2

x=7,2:1,2

x=6

x+20%*x=7,2

x(20%+1)=7,2

x(1/5+1)=7,2

x*6/5=7,2

x*1,2=7,2

x=7,2:1,2

x=6

TÔI CHỊU

Bài 1:

a) \(\dfrac{9}{20}-\dfrac{8}{15}\times\dfrac{5}{12}\)

\(=\dfrac{9}{20}-\dfrac{2}{9}\)

\(=\dfrac{41}{180}\)

b) \(\dfrac{2}{3}\div\dfrac{4}{5}\div\dfrac{7}{12}\)

\(=\dfrac{2}{3}\times\dfrac{5}{4}\times\dfrac{12}{7}\)

\(=\dfrac{5}{6}\times\dfrac{12}{7}\)

\(=\dfrac{10}{7}\)

c) \(\dfrac{7}{9}\times\dfrac{1}{3}+\dfrac{7}{9}\times\dfrac{2}{3}\)

\(=\dfrac{7}{9}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)

\(=\dfrac{7}{9}\times1\)

\(=\dfrac{7}{9}\)

Bài 2:

a) \(2\times\left(x-1\right)=4026\)

\(\left(x-1\right)=4026\div2\)

\(x-1=2013\)

\(x=2014\)

Vậy: \(x=2014\)

b) \(x\times3,7+6,3\times x=320\)

\(x\times\left(3,7+6,3\right)=320\)

\(x\times10=320\)

\(x=320\div10\)

\(x=32\)

Vậy: \(x=32\)

c) \(0,25\times3< 3< 1,02\)

\(\Leftrightarrow0,75< 3< 1,02\) ( S )

=> \(0,75< 1,02< 3\)

\(x+20\%\cdot x=7,2\)

\(x\cdot1+20\%\cdot x=7,2\)

\(x\cdot\left(1+20\%\right)=7,2\)

\(x\cdot\left(1,2\right)=7,2\)

          \(x=7,2:1,2\)

          \(x=6\)

a,\(\Rightarrow x:3=1,56+7,2\)

   \(\Rightarrow x:3=8,76\)

\(\Rightarrow x=8,76\cdot3\)

\(\Rightarrow x=26,28\)

b,\(\Rightarrow x:6=1,248:4\)

\(\Rightarrow x:6=0,312\)

\(\Rightarrow x=0,312\cdot6\)

\(\Rightarrow x=1,872\)

c,(x+x+x+x+...+x)+(2+5+8+....+29)=165

    10 số hạng           10 số hạng

\(\Rightarrow\)10x+(29+2)*10:2=165

\(\Rightarrow\)10x+155=165

\(\Rightarrow10x=165-155\)

\(\Rightarrow10x=10\)

\(\Rightarrow x=10:10\)

\(\Rightarrow x=1\)