Question

Tính nhanh :

25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

Answer 1

\(= 500 × 1000 − ( 8 × 125 ) × ( 20 × 5 )\)

\(=\)\( 500 × 1000 − 1000 × 100\)

\(= 1000 × ( 500 − 100 )\)

\(= 1000 × 400 = 400000\)

 

Answer 2

( 25x 20x125x8)-(8x20x5x125)=400000

 

Answer 3

= 500××1000−( 8×125 ) ×( 20×5 )

= 500××1000−1000×100

= 1000×( 500−100 )

= 1000×400

= 400000