bai1 tính nhanh a,16/11+3/7-5/11-6/14 b,15/16.11/7-15/16.3/7 c,4.(-11).3/4.12/132 d,1/15.-3/11-1/15:11/8 e,2/1.3+2/3.5+2/5.7+2/7.9+2/9.11 KO LÀM TẮT

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1. Đáp án:

    

   Giải thích các bước giải:

   $a,\dfrac{16}{11}+\dfrac{3}{7}-\dfrac{5}{11}-\dfrac{6}{14}$

   $=\left (\dfrac{16}{11}-\dfrac{5}{11} \right )+\left (\dfrac{3}{7}-\dfrac{6}{14} \right )$

   $=1+\left (\dfrac{6}{14}-\dfrac{6}{14} \right )$

   $=1$

   $b,\dfrac{15}{16}.\dfrac{11}{7}-\dfrac{15}{16}.\dfrac{3}{7}$

   $=\dfrac{15}{16}.\left (\dfrac{11}{7}-\dfrac{3}{7} \right )$

   $=\dfrac{15}{16},\dfrac{8}{7}$

   $=\dfrac{15}{14}$

   $c,4.(-11).\dfrac{3}{4}.\dfrac{12}{132}$

   $=\dfrac{1}{11}.(-11).4.\dfrac{3}{4}$

   $=-1.3$

   $=-3$

   $d,\dfrac{1}{15}.\dfrac{-3}{11}-\dfrac{1}{15}:\dfrac{11}{8}$

   $=\dfrac{1}{15}.\dfrac{-3}{11}-\dfrac{1}{15}.\dfrac{8}{11}$

   $=\dfrac{1}{15}.\left (\dfrac{-3}{11}-\dfrac{8}{11} \right )$

   $=\dfrac{1}{15}.(-1)$

   $=-\dfrac{1}{15}$

   $e,\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+\dfrac{2}{9.11}$

   $=1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}$

   $=1-\left (\dfrac{1}{3}-\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{5}+\dfrac{1}{7}-\dfrac{1}{7}+\dfrac{1}{9}-\dfrac{1}{9} \right ) -\dfrac{1}{11}$

   $=1-\dfrac{1}{11}$

   $=\dfrac{11}{11}-\dfrac{1}{11}$

   $=\dfrac{10}{11}$

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2. Đáp án:

    

   Giải thích các bước giải:

    a) `16/11` `+` `3/7` `-` `5/11` `-` `6/14`

   `=` `(16/11` `-5/11)` `+` `6/14` `-` `6/14`

   `=` `-1` `+0`

   `=` `-1`

   `b)` `15/16` `.` `11/17` `-` `15/16` `.` `3/7`

   `=` `15/16` `.` `(11/7` `-3/7)`

   `=` `15/16` `.` `8/7`

   `=` `15/14`

   `c)` `4.` `(-11)` `.` `3/4` `.` `12/132`

   `=` `4.11` `.` `3/4` `.` `1/11`

   `=` `(-11)/11` `.` `4` `.` `3/4

   `=` `-1.3`

   `=` `-3`

   `d)` `1/15` `.` `(-3)/11` `-` `1/15` `:11/8`

   `1/15` `.` `(-3)/11` `-` `1/15` `.8/11`

   `=` `1/15` `.` `(-3)/11` `-` `8/11`

   `=` `1/15` `.` `(-1)`

   `=` `(-1)/15`

   `e)` `2/(1.3)` `+` `2/(3.5)` `+` `2/(5.7)` `+` `2/(7.9)` `+` `2/(9.11)`

   `=` `1` `-1/3` `+1/3-1/5` `+1/5-1/7` `+1/7` `-1/9` `+1/9` `-1/11`

   `=` `1-1/11`

   `=` `11/11-1/11`

   `=` `10/11`

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