Question

tính nhanh:

  3*4+3*56=?

  34*56+34*59=?

Answer 1

a) 3 x 4 + 3 x 56

= 3 x (4 + 56)

= 3 x 60

= 180

b) 34 x 56 + 34 x 59

= 34 x (56 + 59)

= 34 x 115

= 34 x 100 + 34 x 10 + 34 x 5

= 3400 + 340 + 170

= 3910

Answer 2

a)

3*4+3*56

=3*(56+4)

=3*60=180

b)34*56+34*59

=34*(56+59)

=34*115

=3910