Question

Tính nhanh:

3x15+3x27+3x13+3x45.

Answer 1

3×15+3×27+3×13+3×45

=3×(15+27+13+45)

=3×100

=300

Answer 2

3 × 15 + 3 × 27 + 3 × 13 + 3 × 45 

= 3 × ( 15 + 27 + 13 + 45 ) 

= 3 × 100

= 300

Answer 3

3x15+3x27+3x13+3x45

=3x(15+27+13+45)

=3 x 100

=300

:))^^^^ k mk nhé!!!

Answer 4

3 × 15 + 3 × 27 + 3 × 13 + 3 × 45 

= 3 × ( 15 + 27 + 13 + 45 ) 

= 3 × 100

= 300

Answer 5

3 × 15 + 3 × 27 + 3 × 13 + 3 × 45 

= 3 × ( 15 + 27 + 13 + 45 ) 

= 3 × 100

= 300

Answer 6

3×15+3×27+3×13+3×45

=3×(15+27+13+45)

=3×100

=300

Answer 7

3 × 15 + 3 × 27 + 3 × 13 + 3 × 45 

= 3 × ( 15 + 27 + 13 + 45 ) 

= 3 × 100

= 300

P/s tham khảo nha