Question

Tính:

\(\frac{16}{15.31}+\frac{14}{31.45}+\frac{7}{45.52}+\frac{13}{52.65}+\frac{1}{13.70}\)

Answer 1

= 1/15 - 1/31 + 1/31 - 1/45 + 1/45 - 1/52 + 1/52 - 1/65 + 1/13.70

= 1/15 - 1/65 + 1/13.70

= 2/39 + 1/910

= 11/210

Tk mk nha

Answer 2

=(1/15-1/31+1/31-1/45+1/45-1/52+1/52-1/65)+1/910

​=(1/15-1/65)+1/910

​=2/39+1/910=140/2730+3/2730=11/210

​Tk mình nha bn !

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