Bài 2 : Tính bằng cách thuận tiện nhất
a) 1987 + 1992 + 1997 + 2002 + 2007 = ................................
= ................................
= ................................
b) 4,25 + 4,32 + 4,39 + 4,46 + 4,53 =.................................
=................................
=..............................
c) \(\frac{3}{5}+\frac{3}{4}+\frac{2}{5}+\frac{5}{8}+\frac{1}{2}\) =...............................
=..............................
=..............................
d) \(\frac{27}{8}-\frac{7}{3}+\frac{4}{3}-2\)=.............................
=..............................
=..............................
