c

= C nha bn tick 

\(A=468+15\times468+85\times468\\ =468\times\left(1+15+85\right)\\ =468\times101\\ =47268\)

Em xem lại đề câu này không thể tính nhanh được.

\(A=468+15x468+85x468\\ A=468x\left(15+85+1\right)\\ A=468x101\\ A=47268\)

468 + 379 = 847

379 + 468 = 847

`[28xx468xx435xx164]/[435xx432xx984xx468]`

`=[4xx7xx468xx435xx164]/[435xx108xx4xx164xx6xx468]`

`=7/[108xx6]=7/648`

\(\dfrac{\text{28 x 468 x435x 164 }}{435x432x984x468}=\dfrac{7}{108x6}=\dfrac{7}{648}\)

\(\frac{328}{435}\cdot\frac{468}{432}\cdot\frac{435}{164}\cdot\frac{432}{984}\cdot\frac{164}{468}\) 

\(=\frac{328}{984}\) 

\(=\frac{1}{3}\)

a, 6100 + 2900

 = (6000 + 2000) + (100 + 900)

 = 8000 + 1000 = 9000

b, 7825 + 1075

 = (7000 + 1000) + 800 + (25 + 75)

 = 8000 + 800 + 100

 = 8900

c, 285 + 285 + 285 + 285 = 285 × 4 = 1140

d, 2345 + 1745

 = (2000 + 1000) + (300 + 700) + (45 + 45)

 = 3000 + 1000 + 90

 = 4090

a) 468 + 379 = 847

379 + 468 = 847

b) 6509 + 2876 = 9385

2876 + 6509= 9385

c) 4268 + 76 = 4344

76 + 4268 =4344

\(\frac{328}{435}x\frac{435}{164}x\frac{468}{432}x\frac{432}{984}x\frac{164}{468}\)

\(=2x\frac{432}{164}x\frac{164}{468}\)

\(=2x\frac{432}{468}\)

\(=2x\frac{17}{13}\)

\(=\frac{34}{13}\)

328/435x468/432x435/164x432/984x164/468=34/13

khanhly4a1 cho mình nha

\(\frac{1}{3}\)

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