A) (X 5− +) 2X 16= B) X−(4X 13+ )=2C) 12 4X− +(X 8− )= −14 D) −(2X 3− ) (+ 4 X+ )=0E) 3X 27 2 X 4+ − ( − )= −13

Bài 21. Tìm x biết: a)

(

x 5− +

)

2x 16= b) x

(

4x 13+

)

=2c) 12 4x +

(

x 8

)

= −14 d)

(

2x 3

) (

+ 4 x+

)

=0e) 3x 27 2 x 4+ −

(

)

= −13.195 13.95+ f)

(

x 1− +

) (

x 2

)

+....+

(

x 100

)

=2750