Question

4/9+8/9+12/9+16/9+....+48/9+52/9+56/9

Answer 1

4/9+8/9+12/9+16/9+...+48/9+52/9+56/9
=4+8+12+16+...+48+52+56/9
xét 4+8+12+16+...+48+52+56.
số số hạng là: (56-4):4+1= 14 số
4+8+12+16+...+48+52+56= (56+4)*14:2=420
suy ra: 4+8+12+16+...+48+52+56/9= 420/9
                                                    = 140/3

Answer 2

4/9+8/9+12/9+16/9+..+48/9+52/9+56/9

=4+8+12+16+...+48+52+56/9

xét 4+8+12+16+...+48+52+56

số số hạng là:

(56-4):4+1=14 số

4+8+12+16+...+48+52+56

=(56+4)x14:2=420

=>4+8+12+16+..+48+52+56/9

=420/9=140/3