Question

tính nhanh :

10 . 3 + 10 . 4 + 10 . 5 + ... + 10 . 10

Answer 1

10 . 3 + 10 . 4 + 10 . 5 + ... + 10 . 10

=10.(3+4+5+6+7+8+9+10)

=10.52

520

Answer 2

10 . 3 + 10 . 4 + 10 . 5 + ... + 10 . 10=

10*(3+4+5+..+10)

=10*52=520

Answer 3

10.3+10.4+10.5+...+10.10

=10.(3+4+5+6+7+8+9+10)

=10.52

=520

tick nha