Question

Tính nhanh

a)123x8+123x2

b)45x12+45x88

Answer 1

123.(8+2)=123.10=1230

45.(12+88)=45.100=4500

Answer 2

a) 123 x 8 + 123 x 2

= 123 x (8 + 2)

= 123 x 10

= 1230

b) 45 x 12 + 45 x 88

= 45 x (12 + 88)

= 45 x 100

= 4500

Answer 3

a, 123 x 8 + 123 x 2

= 123 x (8 + 2)

= 123 x   10

= 1 230.

b,45 x 12 + 45 x 88

= 45 x (12 + 88) 

= 45 x   100

=    4 500.