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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{3}\)= x - \(\dfrac{4}{27}\)
\(\dfrac{18}{27}\) = x - \(\dfrac{4}{27}\)
x = \(\dfrac{18}{27}\) + \(\dfrac{4}{27}\)
x = \(\dfrac{22}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a+ax2+ax3+...+ax49+ax50=12750
ax(1+2+3+...+49+50)=12750
ax1275=12750
a=12750:1275
a=10
Ta có : a + a × 2 + a × 3 + a × 4 + … + a × 49 + a × 50 = 12750
<=> a.(1 + 2 + 3 + ...... + 50) = 12750
=> a.1275 = 12750
=> a = 12750 : 1275
=> a = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
theo đề ta có: a x ( 1+2+3+4+5.......+45+46+47+48+49+50)= 12750
=> a x 1275 = 12750
=> a = 12750 : 1275
=> a = 10
chúc bn hc giỏi và luôn luôn thành công trong hc tập,nhi nhé!
![](https://rs.olm.vn/images/avt/0.png?1311)
a + a × 2 + a × 3 + a × 4 + … + a × 49 + a × 50 = 12750
a x (1 + 2 + 3 + 4 + ... + 49 + 50) = 12750
a x 1275 = 12750
a = 12750 :1275
a = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
=>a-4/27=2/3
=>a=22/27