a.(-17/28+ 18/29- 19/30- 20/31)x (-5/12+ 1/4+ 1/6) b.(1/2-1)x (1/3-1)x (1/4-1)x…x (1/100-1) c.-3/22x 8/32x 15/4^2x…899/30^2

a.(-17/28+ 18/29- 19/30- 20/31)x (-5/12+ 1/4+ 1/6)
b.(1/2-1)x (1/3-1)x (1/4-1)x…x (1/100-1)
c.-3/22x 8/32x 15/4^2x…899/30^2
mọi người hepl mik với sắp nộp bà rùi!!!!