`i) (-1/5+ 3/7): 2/11+ (-4/5+ 4/7): 2/11` Tihs hợp lí `a) 1- 1/2+ 2- 2/3+ 3- 3/4+ 4- 1/4- 3- 1/3- 2- 1/2- 1`

0 bình luận về “`i) (-1/5+ 3/7): 2/11+ (-4/5+ 4/7): 2/11` Tihs hợp lí `a) 1- 1/2+ 2- 2/3+ 3- 3/4+ 4- 1/4- 3- 1/3- 2- 1/2- 1`”

1. Đáp án:

    

   Giải thích các bước giải:

   i, $$(\frac{-1}{5} + \frac{3}{7}) : \frac{2}{11} + (\frac{-4}{5} + \frac{4}{7}) : \frac{2}{11} 

   =(\frac{-1}{5} + \frac{3}{7}) × \frac{11}{2} + (\frac{-4}{5} + \frac{4}{7}) × \frac{11}{2} 

   =(\frac{-1}{5} + \frac{3}{7} – \frac{4}{5} + \frac{4}{7}) × \frac{11}{2}

   =0 × \frac{11}{2}

   =0$$

   a, $1-\frac{1}{2}+2-\frac{2}{3}+3-\frac{3}{4}+4-\frac{1}{4}-3-\frac{1}{3}-2-\frac{1}{2}-1

   =(1+2+3+4-3-2-1) – (\frac{1}{2}+\frac{1}{2})-(\frac{2}{3}+\frac{1}{3})-(\frac{3}{4}+\frac{1}{4})

   =4-1-1-1

   =1$

    

   Bình luận

2. i,

   `(-1/5 + 3/7) : 2/11 + (-4/5 + 4/7) : 2/11`

   `=(-1/5 + 3/7).  11/2 + (-4/5 + 4/7).  11/2`

   ` = (-1/5 – 4/5 + 3/7 + 4/7 ) .   11/2`

   ` = ( -1 + 1) . 11/2`

   ` = 0`

   a, 

   `1-1/2 + 2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1`

   `=(1-1) + (-1/2-1/2)+(2-2)+(-2/3-1/3)+(3-3)+(-3/4-1/4)+4`

   `= 0 – 1 + 0 – 1 + 0 – 1 + 4`

   `= – 3+4=1`

    

   Bình luận