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
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\(\frac{4}{9}+\frac{8}{9}+\frac{12}{9}+\frac{16}{9}+...+\frac{48}{9}+\frac{52}{9}+\frac{56}{9}\)
\(=\frac{4+8+12+16+...+48+52+56}{9}\)
\(=\frac{\left(56+4\right).14:2}{9}\)
\(=\frac{420}{9}\)
\(=\frac{140}{3}\)
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
\(=\frac{\left(4+56\right)+\left(8+52\right)+...+\left(24+36\right)+\left(28+32\right)}{9}\)
\(=\frac{60+60+60+60+60+60+60}{9}\)
\(=\frac{420}{9}\)
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
