c) x+x-1+x-2+x-3+...+x-50=255
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\(x-1+x-2+x-3+...................+x-50=225\)
\(\Rightarrow\left(x+x+x+...............+x\right)-\left(1+2+3+..............+50\right)=225\)
\(\Rightarrow50x-1275=225\)
\(\Rightarrow50x=1500\)
\(\Rightarrow x=30\)
\(\frac{x+1}{2}=\frac{8}{x+1}\)
\(\Rightarrow\left(x+1\right)^2=16\)
\(\Rightarrow\orbr{\begin{cases}x+1=16\\x+1=-16\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=15\\x=-17\end{cases}}\)
51x - ( 1+2+3+4+....+50) = 255
51x - 1275 = 255
51x = 255 + 1275
51x = 1530
x= 1530 : 51
x =30
x+x-1+x-2+x-3+x-4+...+x-50 = 255
- 51x - (50 + 49 + 48 + ....+ 1) = 255
- 51x - 1275 = 255
- 51x 255 + 1275
- 51x = 1530
- x = 1530 : 51
- x = 30
51x - [1+2+3+...+50] =255
=> 51x - 50 x 51 : 2 = 255
=> 51x - 1275 =255
=> 51x = 1530
=> x = 30
\(51x-\left(1+2+3+..+50\right)=255\)
\(51x-\frac{51.50}{2}=255\)
\(51x-1275=255\)
\(\Rightarrow51x=255+1275\)
\(\Rightarrow51x=1530\)
\(\Rightarrow x=30\)
x+x-1+x-2+x-3+....+x-50 = 255
x+x+x+...+x - (1+2+3+...+50) = 255
51x - 1275 = 255
=> 51x = 1530
=> x = 30
a: =>3/2x-1/4x=10
=>1,25x=10
hay x=8
b: =>51x-1225=255
=>51x=255+1225=1480
=>x=1480/51
c) x+x-1+x-2+x-3+...+x-50=255
51x-(50+49+48+...+1)=255
51x-1275=255
51x=255+1275
51x=1530
x=1530:51
x=30
x=30,52
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