a, +-1+x-2+x-3+.......+x-50=255
b,-(5/6-x)=x-2/3
c,x-{x-[x-(-x+1)]}
d, x+1/2= 8/x+1
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15 tháng 2 2019
7/x=y/27=-42/54=-7/9
7/x=-7/9 nên x=-9
y/27=-7/9=-21/27 nên y=-21
19 tháng 2 2021
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\(x-1+x-2+x-3+...................+x-50=225\)
\(\Rightarrow\left(x+x+x+...............+x\right)-\left(1+2+3+..............+50\right)=225\)
\(\Rightarrow50x-1275=225\)
\(\Rightarrow50x=1500\)
\(\Rightarrow x=30\)
\(\frac{x+1}{2}=\frac{8}{x+1}\)
\(\Rightarrow\left(x+1\right)^2=16\)
\(\Rightarrow\orbr{\begin{cases}x+1=16\\x+1=-16\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=15\\x=-17\end{cases}}\)
hahaha