1 tính nhanh . 4 / 3x6 + 4 / 6x3 + 4/ 9 x12 + 4/12x15
2 . tính nhanh : 7/1x5x8 + 7/5x8x12 +7/8x12x12 + ...+ 7/ 32x36x 45
3. tinh nhanh : 328/435 x 438/432 x 435/164 x 432/984 x 164/468
làm được hết mình tặng 5 like
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a) \(\dfrac{4}{6}+\dfrac{7}{13}+\dfrac{17}{9}-\dfrac{8}{9}+\dfrac{14}{6}+\dfrac{19}{13}\)
\(=\dfrac{2}{3}+\dfrac{7}{13}+\dfrac{17}{9}-\dfrac{8}{9}+\dfrac{7}{3}+\dfrac{19}{13}\)
\(=\left(\dfrac{2}{3}+\dfrac{7}{3}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)+\left(\dfrac{17}{9}-\dfrac{8}{9}\right)\)
\(=\dfrac{9}{3}+\dfrac{26}{13}+\dfrac{9}{9}\)
\(=3+2+1\)
\(=6\)
b) \(\dfrac{328}{435}\times\dfrac{468}{432}\times\dfrac{435}{164}\times\dfrac{432}{984}\times\dfrac{164}{468}\)
\(=\dfrac{328\times468\times435\times432\times164}{435\times432\times164\times984\times468}\)
\(=\dfrac{328}{984}\)
\(=\dfrac{1}{3}\)
\(\frac{328}{435}\cdot\frac{468}{432}\cdot\frac{435}{164}\cdot\frac{432}{984}\cdot\frac{164}{468}\)
\(=\frac{328}{984}\)
\(=\frac{1}{3}\)
\(\frac{328}{435}x\frac{435}{164}x\frac{468}{432}x\frac{432}{984}x\frac{164}{468}\)
\(=2x\frac{432}{164}x\frac{164}{468}\)
\(=2x\frac{432}{468}\)
\(=2x\frac{17}{13}\)
\(=\frac{34}{13}\)
328/435x468/432x435/164x432/984x164/468=34/13
khanhly4a1 cho mình nha
`[28xx468xx435xx164]/[435xx432xx984xx468]`
`=[4xx7xx468xx435xx164]/[435xx108xx4xx164xx6xx468]`
`=7/[108xx6]=7/648`
\(\dfrac{\text{28 x 468 x435x 164 }}{435x432x984x468}=\dfrac{7}{108x6}=\dfrac{7}{648}\)
a/\(\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{25}{28}\)
\(=1\times\dfrac{25}{28}\)
\(=\dfrac{25}{28}\)
b/\(\dfrac{4}{7}\times\dfrac{17}{18}\times\dfrac{7}{4}\times\dfrac{18}{17}\)
\(=\left(\dfrac{4}{7}\times\dfrac{7}{4}\right)\times\left(\dfrac{17}{18}\times\dfrac{18}{17}\right)\)
\(=1\times1\)
\(=1\)
Mik là ARMY nè.
Đáp án thì mik ko bt
Tk mik nha
Kb lại vs mik vì mik kb vs bn nhưng hình như bn ko đồng ý