1/3.4 + 1/4.5 +1/5.6 + 1/6.7 + 1/7.8 giúp mk vs mai mk thi rồi

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1. Đáp án:

    `1/(3.4) +1/(4.5) +1/(5.6) +1/(6.7) +1/(7.8)`

   `=1/3 – 1/4 +1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8`

   `=1/3 – (1/4-1/4) -(1/5-1/5) -(1/6-1/6)-(1/7-1/7) -1/8`

   `=1/3 – 0 – 0 – 0 – 0 -1/8`

   `=1/3- 1/8`

   `=8/24 – 3/24=5/24`

   XIN HAY NHẤT NAH

   @ Hoàng

    

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2. Ta có :

   1/3.4 + 1/4.5 + 1/5.6 + 1/6.7 + 1/7.8

   = 1/3 – 1/4 + 1/4 – 1/5  + 1/5 – 1/6 + 1/6 -1/7 + 1/7 – 1/8

   = 1/3 – 1/8 = 5/24 

   CHÚC BẠN BỌC TỐT NHÉ

    

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