Question

Tính nhanh

5+9+13+17+21+25+29+33+37=?

 

Answer 1

khó đây

Answer 2

=(5+25)+(9+21)+(13+27)+(17+33)+29

=    30   +   30   +     40    +   50     +29

=           60          +           90          + 29

=                      150  +   29

                                 179

Answer 3

=(5+25)+(9+21)+(13+37)+(33+17)+29

=30+30+50+50+29

=160+29

=189

Answer 4

5 + 9 + 13 + 17 + 21 + 25 + 29 + 33 + 37

= ( 5 + 25 ) + ( 9 + 21 ) + ( 13 + 27 ) + ( 17 + 33 ) + 29

= 30 + 30 + 40 + 50 + 29

= 60 + 40 + 50 + 29

= 100 + 50 + 29

= 150 + 29

= 179