Question

8 x 75 x 3 + 6 x 25 x 4 - 240
______________________
15 x 2 x 6 + 18 x 16 x5
tính nhanh 

Answer 1

8 x 75 x 3 + 6 x 25 x 4 - 240
___________________________
15 x 2 x 6 + 18 x 16 x5

= 24 x 75 + 24 x 25 - 240 x 10
_________________________
  3 x 5 x 2 x 6 + 3 x 6 x 2 x 8 x5

= 24 x (75 + 24 -10)
  _________________
   3x5x2x6x ( 1+8)

= 24 x 9 x 10          4
   _________=     ___
    18 x 10 x 9         3

Answer 2

\(Tử=8.75.3+6.25.4-240=24\left(75+25\right)-240=24.100-240=24.90\)

Mẫu = \(15.2.6+18.16.5=18.10+18.80=18.90\)

Tử / Mẫu = \(\dfrac{24}{18}=\dfrac{4}{3}\)