1/2 - 43/101 + ( -1/3) - 1/6

bài 1:

a) 1/2 - 43/101 + ( -1/3) - 1/6

b) x + 4/2000 + x +3/2001 + x + 2/2002 + x + 1/2003

giúp mik vs ạ