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

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Answer 3

\(\frac{4}{9}+\frac{8}{9}+\frac{12}{9}+\frac{16}{9}+...+\frac{48}{9}+\frac{52}{9}+\frac{56}{9}\)

\(=\frac{4+8+12+16+...+48+52+56}{9}\)

\(=\frac{\left(56+4\right).14:2}{9}\)

\(=\frac{420}{9}\)

\(=\frac{140}{3}\)

Answer 4

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 5

\(=\frac{\left(4+56\right)+\left(8+52\right)+...+\left(24+36\right)+\left(28+32\right)}{9}\)

\(=\frac{60+60+60+60+60+60+60}{9}\)

\(=\frac{420}{9}\)

Answer 6

4/9+8/9+12/9+16/9+...+49/9+52/9+56/9

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

xét 4+8+12+16+...+48+52+56

só 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