Question

71x45+15x15+9x100+180

Tính nhanh

Answer 1

71x45+15x15+9x100+180

=71x45+5x3x15+9x5x20+45x4

=45x(71+5+20+4)

=45x100=4500

Answer 2

71 x 45 + 15 x 15 + 9 x 100 + 180

= 71 x 45 + 5 x 3 x 15 + 9 x 5 x 20 + 45 x 4

= 45 x ( 71 + 5 + 20 + 4 )

= 45 x 100

= 4500

Answer 3

Ta có: 71 x 45 + 15 x 15 + 9 x 100 + 180

= 71 x 45 + 5 x 45 + 45 x 20 + 45 x 4

= 45 x ( 71 + 5 + 20 + 4 )

= 45 x 100

= 4500