TÌM XA) ( X-4 ).( X+5 ) = 0 B) 5

Bài 3 : Tìm x

a) ( x-4 ).( x+5 ) = 0 b) ^{5 : 4 13}

7 x 

c)  ^{4,5 2 .}  ^{4 11}

x

  d) 60% x + ^{2 684}

9 4

3 x 