Question

Tính nhanh

746 x 79 + 746 + 746 x 20

129 x 78 - 78 x 28

7 x 25 x 5 x 4

Answer 1

746x79+746+746x20=746x(79+1+20)

                              =746x100

                              =74600

129x78-78-28=78x(129-28)

                   =78x101

                   =7878

7x25x5x4=(25x4)x(7x5)

              =100x35

              =3500

tick mình nha!

Answer 2

74600

7800

3500

Answer 3

746 x 79 + 746 + 746 x 20=746x(79+1+20)=746x100=74600

129 x 78 - 78 x 28=78x(129-28)=78x101=7878

7 x 25 x 5 x 4=(25x4)x(7x5)=100x35=3500