e) -12/17 + 7/13 + -5/17 + 6/13 – 20/5 f) [(-24,2) + 4,525] – (-11,2 + 3,525)

2 bình luận về “e) -12/17 + 7/13 + -5/17 + 6/13 – 20/5 f) [(-24,2) + 4,525] – (-11,2 + 3,525)”

1. $e)$  $\dfrac{-12}{17}$ + ( $\dfrac{7}{13}$ + $\dfrac{- 5}{17}$ ) + $\dfrac{6}{13}$ – $\dfrac{20}{5}$

   $=$ ( $\dfrac{-12}{17}$ – $\dfrac{5}{17}$ ) + ( $\dfrac{7}{13}$ + $\dfrac{6}{13}$ ) – $\dfrac{20}{5}$

   $=$ $\dfrac{-17}{17}$ + $\dfrac{13}{13}$ – $\dfrac{20}{5}$

   $= – 1 + 1 -$ $\dfrac{20}{5}$

   $=$ $-$ $\dfrac{20}{5}$

   $= – 4$

   $f) [(-24,2) + 4,525] – (-11,2 + 3,525)$

   $= (- 24,2 + 4,525 ) – (- 11,2 + 3,525)$

   $= – 24,2 + 4,525  +  11,2 – 3,525$

   $= – 13 + 1$

   $= – 12$

   Trả lời
2. Giải đáp:

    e)

   -\frac{12}{17}+\frac{7}{13}+(-\frac{5}{17})+\frac{6}{13}-\frac{20}{5}

   =[(-\frac{12}{17})+(-\frac{5}{17})]+(\frac{7}{13}+\frac{6}{13})-4

   =\frac{-17}{17}+\frac{13}{13}-4

   =(-1)+1-4

   =(1-1)-4

   =0-4

   =-4

   f)

   [(-24,2)+4,525]-(-11,2+3,525)

   =(-24,2)+4,525+11,2-3,525

   =-(24,2-11,2)+(4,525-3,525)

   =-13+1

   =-12

    

   Trả lời