A, √25X = 6 + √9X B, √4X2−12X+9 = 5 C, √4+X=3−√1− X

Câu5: Tìm x biết :

a,

25

x

= 6 +

9

x

b,

4

x

2

12

x

+

9

= 5 c,

4+

x=3

1− x