Question

tinh nhanh gia tri cac bieu thuc sau

a , 1/ 2+ 1 /3 + 1 / 4 + 1/ 6

b, 53 / 4 . 11/ 16 - 23/4 . 11/16 

 c, 3/ 8 . ( 2 /9 + 4 /15 )

Answer 1

a , 1/ 2+ 1 /3 + 1 / 4 + 1/ 6

=5/6+1/4+1/6

=1+1/4

=5/4

Answer 2

b, 53 / 4 . 11/ 16 - 23/4 . 11/16 

=11/16(53/4+23/4)

=11/6.19

=209/6

Answer 3

53 / 4 . 11/ 16 - 23/4 . 11/16 

=11/6,19

=209/6

Answer 4

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