Question

Tính 1x2 + 3x4 + 5x6 +7x8 + 9x10

Answer 1

1x2 + 3x4 + 5x6 + 7x8 + 9x10

=2 + 12 +30 +56 +90

=14 + 30 + 56 + 90

=44 +56 + 90

=100 + 90

=190

tk nhé

Answer 2

1x2 + 3x4 + 5x6 +7x8 + 9x10

= 2 + 12 + 30 + 56 + 90

= 14 + 60 + 56 + 90

= 74 + 56 + 90

= 130 + 90

= 220

Answer 3

1 x 2 + 3 x 4 + 5 x 6 + 7 x 8 + 9 x 10

= 2   +    12   +   30   +   56   + 90

= 14 + 30 + 56 + 90

=   70 + 30 + 90

= 100 + 90

= 190