Bài 1: Tìm x biết :
a) 2/3 . x = -4/27
b) -1/3/5 . x = 1/1/15
c) 1/3 + 1/2 : = -4/1
d) ( x – 2/3 ) . ( x + 1/4) = 0
Bài 2: Thực hiện phép tính:
1/3 – 1/7 – 1/13 3/4 - 3/16 – 3/64 – 3/256 ---------------------- . --------------------------------- + 5/8
2/3 - 2/7 – 2/13 1 – 1/4 – 1/16 – 1/64