Question

Tính nhanh:

34 x (52 - 85) - 52 x (85 +34)

Answer 1

34 x (52 - 85) - 52 x (85 + 34)

= 34 x 52 - 34 . 85 - 52 x 85 - 52 x 34

= (34 x 52 - 52 x 34) - (34 + 52) x 85

= 86 x 85

= 7310

Answer 2

   34 x (52 - 85) - 52 x (85 + 34)

= 34 x 52 - 34 x 85 - ( 52 x 85 + 52 x 34)

= 34 x 52 - 34 x 85 - 52 x 85 - 52 x 34

= (34 x 54 - 52 x 34) + (34 - 52) x 85

= 0 + (-18) x 85

= -1530