a)2/3-4.(1/2+3/4) b)(-5/9).3/11+(-13/18).3/11 c)(-1/3+5/6).11-7 d)(-2/3).3/11+(-16/9).3/11 e)11/125-17/18-5/7+4/9+17/14 Lưu ý 1/1 là $\frac{1}{1}$

0 bình luận về “a)2/3-4.(1/2+3/4) b)(-5/9).3/11+(-13/18).3/11 c)(-1/3+5/6).11-7 d)(-2/3).3/11+(-16/9).3/11 e)11/125-17/18-5/7+4/9+17/14 Lưu ý 1/1 là $\frac{1}{1}$”

1. Đáp án:

   a) `\frac{2}{3}- 4.(\frac{1}{2}+\frac{3}{4})`

   `=\frac{2}{3}- 4. \frac{5}{4}`

   `=\frac{2}{3}- 5`

   `=-\frac{13}{3}`

   b) `(-\frac{5}{9}) . \frac{3}{11} + (-\frac{13}{18}) . \frac{3}{11} `

   `=[(-\frac{5}{9}) + (-\frac{13}{18})] . \frac{3}{11} `

   `= (-\frac{23}{18}) . \frac{3}{11} `

   `= -\frac{23}{66}`

   c) `(-\frac{1}{3} + \frac{5}{6}) . 11 – 7`

   `= \frac{1}{2} . 11 – 7`

   `= \frac{11}{2}  – 7`

   `= -\frac{3}{2} `

   d) `(-\frac{2}{3}) . \frac{3}{11} + (-\frac{16}{9}) . \frac{3}{11} `

   `=[(-\frac{2}{3}) + (-\frac{16}{9})] . \frac{3}{11} `

   `=(-\frac{22}{9}) . \frac{3}{11} `

   `=-\frac{2}{3}`

   e) `\frac{11}{125} – \frac{17}{18} – \frac{5}{7} + \frac{4}{9} + \frac{17}{14}` 

   `=\frac{11}{125} + [(\frac{-17}{18} + \frac{4}{9}) + (\frac{-5}{7} + \frac{17}{14})]` 

   `=\frac{11}{125} + [(\frac{-1}{2}) + \frac{1}{2} ]` 

   `=\frac{11}{125} + 0` 

   `=\frac{11}{125} `

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2. a) 2/3-4.5/4=2/3.5=10/3

   b)-5/33+(-13/66)=-23/66

   c)1/2.11-7=11/2-7=-3/2

   d)-2/11+(-16/33)=-2/3

   e) 0,088

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