Question

 tìm x 

a, 12x +69-23 =109

b, 56/x +49=7

Answer 1

a) 12x + 69 - 23 = 109

12x + 46 = 109

12x = 63

x = 21/4 

b) 56/x + 49 = 7

56/x = -42

x = 56/-42 

x = -4/3 

Answer 2

12x+69-23=109

12x+69=109+23

12x+69=132

12x-132-69

12x=63

x=63/12

x=21/4

56/x+49=7

x+49=56/7

x+49=8

x=8-49

x=-41

kick nha minh nhanh nhat

Answer 3

\(12x+69-23=109\)

\(\Rightarrow12x+46=109\)

\(\Rightarrow12x=63\)

\(\Rightarrow x=\frac{63}{12}\)

\(\Rightarrow x=5,25\)

b) \(\frac{56}{x}+49=7\)

\(\Rightarrow\frac{56}{x}=-42\)

\(\Rightarrow-42x=56\)

\(\Rightarrow x=\frac{-4}{3}\)