Bài 1
a) ( -5/11 : 13/8 - 5/11 : 13/5 ) + -1/33
b) ( -1)^3/15 + ( -2 )^2/3 : 2/2/3 - l -5/6l
Bài 2
a) 3/4 : 2/4/9 - l -3x + 2/2/3 l = 3/4
b) l x-1/3l = l 2-3xl
c) ( 3/5/7x - 1/5/7x ) - 1/3 = 2/3
d) ( x+3)^5 / ( x +3)^2 = 64/ 27
e) ( 4/13 . 6/5+ 4/13. 2/5 ) . ( 2x+1)^2 = 10/13