Tính nhanh a) 4/6+7/13+17/9-8/9+14/6+19/13 b) 328/435×468/432×435/164×432/984×164/468 Em cần gấp ạ
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\(\frac{328}{435}\cdot\frac{468}{432}\cdot\frac{435}{164}\cdot\frac{432}{984}\cdot\frac{164}{468}\)
\(=\frac{328}{984}\)
\(=\frac{1}{3}\)
\(\frac{328}{435}x\frac{435}{164}x\frac{468}{432}x\frac{432}{984}x\frac{164}{468}\)
\(=2x\frac{432}{164}x\frac{164}{468}\)
\(=2x\frac{432}{468}\)
\(=2x\frac{17}{13}\)
\(=\frac{34}{13}\)
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)
= (4/6+14/6)+(7/13+19/13)-(17/9-8/9)
= 3 + 2 - 1
= 4 ( Thể : 5-1 Xuống dòng = 4)
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) \(\dfrac{328}{435}\times\dfrac{468}{432}\times\dfrac{435}{164}\times\dfrac{432}{984}\times\dfrac{164}{468}\)
\(=\dfrac{328\times468\times435\times432\times164}{435\times432\times164\times984\times468}\)
\(=\dfrac{328}{984}\)
\(=\dfrac{1}{3}\)