Ta có: \(1+3+5+...+\left(2x-1\right)=1069\)
\(\Leftrightarrow\frac{\left(2x-1+1\right)\cdot\left[\left(2x-1-1\right)\div2+1\right]}{2}=1069\)
\(\Leftrightarrow\frac{2x\cdot\left(x-1+1\right)}{2}=1069\)
\(\Leftrightarrow x^2=1069\)
\(\Rightarrow x=\sqrt{1069}\)
Số số hạng
\(\left(2x-1-1\right):2+1=x\)
Tổng
\(\left(2x-1+1\right)\cdot x:2=x^2\)
\(x^2=1069\left(x\ge0\right)\)
\(x=\sqrt{1069}\)
\(x=33\)
tìm x biết -5.(x+1/5)-1/2.(x-2/3)=3/2x-5/6
Tìm x biết:
1) 1/3x+2/5(x-1)=0
2) -2/3-1/3(2x-5)=3/2
3) (3x-1)[-1/2x+5]=0
tìm x , biết :
a, (x-1/5).(x-1+3/5)<0
b,(x-4/7):(x+1/2)>0
c,(2x-3):(x+1+3/4)
d,|2x-1|+1=2x
Tìm x biết
-5(x+1/5)-1/2(x-2/3)=3/2x-5/6
Tìm x, biết
a)-2x+ -3/4 = x-3/5
b)|1/2x-1/3|-3/2=1/4
Tìm x biết
-5(x+1/5)-1/2(x-2/3)=3/2x-5/6
3(x-1/2)-5(x+3/5)=-x+1/5
Tìm x,biết:
a)-5×(x+1/5)-1/2×(x-2/3)=3/2x-5/6
b)3×(x-1/2)-5(x+3/5)=-x+1/5
tìm x biết : 2/3-1/3 x (X-3/2) - 1/2 x (2X+1)=5
Tìm x biết
3(X-1/2) - 5(X-2/3) =3/2 x X
2X - 5/4 = (3 - 1/2) (X-1/2)
I x -1 I +1 = 2x - 3
