a)11.(7-25)+7.(25-11) b)-5/7+-3/-5+5/7 c)-2/3+10/14.-7/15 d)-2/5-3/7+10/7–7/5 Giups mik can gap CAM ON

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1. a) =11.(-18)+7.24

       =-189+168

       =-21

   b) = (-5/7 +5/7)+3/5

       =0+3/5

       =3/5

   c) =-2/3-1/3

      =-1

   d) =(-2/5–7/5)-(3/7-10/7)

       =1–1

       =2

    

    

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2. $#ngocninh2009$

   `a)11.(7-25)+7.(25-11)`

   `=11.(-18)+7.24`

       `=-189+168`

       `=-21`

   `b)-5/7+ -3/-5 +5/7`

   `= (-5/7 +5/7)+3/5`

       `=0+3/5`

       `=3/5`

   `c)-2/3+10/14. -7/15`

   `=-2/3-1/3`

      `=-1`

   `d)-2/5 – 3/7 +10/7- -7/5`

   `=(-2/5-7/5)-(3/7-10/7)`

       `=1-(-1)`

       `=2`

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