a,2/3-4.(1/2+3/4) b,(-1/3-5/6)-11-7 c3/4-3/5+3/7+3/11 trên 13/4-13/5+13/7+13/11 20/08/2021 Bởi Hadley a,2/3-4.(1/2+3/4) b,(-1/3-5/6)-11-7 c3/4-3/5+3/7+3/11 trên 13/4-13/5+13/7+13/11
Lời giải: `2/3-4*(1/2+3/4)` `=2/3-4*5/4` `=2/3 – 5` `=-13/3` ; ; `(-1/3-5/6)-11-7` `=-7/6 – 11-7` `=-73/6 -7` `=-115/6` ; ; $\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{11}}{\dfrac{13}{4}-\dfrac{13}{5}+\dfrac{13}{7}+\dfrac{3}{111}}$ $\dfrac{3.(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{11})}{13.(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{11})}$ `=3/13` Bình luận
Lời giải:
`2/3-4*(1/2+3/4)`
`=2/3-4*5/4`
`=2/3 – 5`
`=-13/3`
;
;
`(-1/3-5/6)-11-7`
`=-7/6 – 11-7`
`=-73/6 -7`
`=-115/6`
;
;
$\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{11}}{\dfrac{13}{4}-\dfrac{13}{5}+\dfrac{13}{7}+\dfrac{3}{111}}$
$\dfrac{3.(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{11})}{13.(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{11})}$
`=3/13`
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