Question

a) 3\x+2=5\2x+1 

b)-8\3x-1=4\-7 

ai lam ho minh nhanh cai

 

Answer 1

TA CÓ: 3/x+2 =5/ 2x+1

=> 3/x+2 - 5/2x+1 = 0

=>3(2x+1) - 5(x+2)/ (x+2)(2x+1) =0

=> 6x + 3 - 5x - 10/ (x+2)(2x+1) =0

=> x-7/ (x+2)(2x+1) =0

 mà  (x+2)(2x+1)  khác không nên x-7 = 0

=> x=7 

b) Ta có : -8/3x -1 =4/-7

=>-8/3x-1 = 8/-14= -8/14

=>3x-1 = 14 

=> 3x =14+1 =15

=> x = 15/3 =5

Answer 2

a.    0,1428571409

b.    1,125

Answer 3

tim x ,y ma

Answer 4

\(\frac{3}{x}+2=\frac{5}{2}+1\)

\(\frac{3}{x}+2=\frac{7}{2}\)

\(\frac{3}{x}=\frac{7}{2}-2\)

\(\frac{3}{x}=\frac{3}{2}\)

Suy ra x = 2

chúc bạn học tốt!

Answer 5

v~ sai rồi 

 

Answer 6

nham de bai roi

Answer 7

Ta có: \(\frac{3}{x+2}=\frac{5}{2x+1}\)

\(\Leftrightarrow3.\left(2x+1\right)=5.\left(x+2\right)\)

\(\Rightarrow6x+3=5x+10\)

\(\Rightarrow6x-5x=10-3\)

\(\Rightarrow x=7\)