Question

tính  nhanh : 532 * 7 - 266 * 4

Answer 1

 532 * 7 - 266 * 4

= 266x2x7-266x4

= 266x14-266x4

= 266x(14-4)

= 266x10

= 2660

Answer 2

532 * 7 - 266 * 4 = (500 + 30 + 2) * 7 - (200 + 60 + 6) * 4

                        = 3500 + 210 + 14 - 800 - 240 - 24

                        = 3420 - 30 - 10 = 2660

Answer 3

Ta thấy :

532 : 2 = 266

Vậy :

532 x 7 - 266 x 4

= 266 x 2 x 7 - 266 x 4

= 266 x 14 - 266 x 4

= 266 x 10

= 2660