\(x^{10}=1^x\)
tim x
tim x biet x+10 la boi cua x+1
tim x biet 2x+1 la uoc cua x+82
Bạn Nguyễn Đoan Hạnh cho mình bổ sung nhé
Ư(9)={+-1;+-3;+-9}
Nếu x+1=-1 => x=-2
Nếu x+1=-3 => x = -4
Nếu X+1=-9 => x = -10
x+10 la boi cua x+1
suy ra (x+1)+9 la boi cua x+1
suy ra 9 la boi cua x+1
U(9)={1;3;9}
Neu x+1=1 thi x=0
Neu x+1=3 thi x=2
Neu x+1=9 thi x=8
Vay x thuoc {0;2;8}
Tim x biet:
|x-10|10+|x-11|10=1
tim x
(x-1)(x-10)x=0
Th1:x - 1 = 0 => x= 1
Th2: x - 10 = 0 => x = 10
Th3: x = 0
VẬy x thuộc {1;10;0}
tim x : (x+1)+(x+4)+(x+7)+(x+10)+(x+13)+...................+(x+28)=155
(x+1)+(x+4)+.....+(x+28)=155 tìm x
(x+x+.....+X)+(1+4+...+28)=155
10 x
10x + 145 =155
10x=10
x=10:10
x=1
Tim x
|x+1|+|x+2|+...+|x+10|=7x
|x+1|+|x+2|+....+|x+10|=7x
= | 10x | + (1+2+3....+10)=7x
=> | 10x | + 55 =7x
=> 55 = -3x
=> x= 55 : (-3)=-18,333..
hình như đề sai
Vì |x+1| ≥ 0; |x+2|≥0 ;...; |x+10| ≥ 0 => |x+1|+|x+2|+...+|x+10| ≥ 0 => 7x ≥ 0 => x ≥ 0
=>x+1+x+2+...+x+10=7x
=>10x+55 = 7x
=>10x-7x=-55
=>3x=-55
=>x=-55/3
tim x : (1-3/10-x):(19/10-1-2/5)+4/5=1
tim x : (1-3/10-x):(19/10-1-2/5)+4/5=1
\(\left(1-\frac{3}{10}-x\right):\left(\frac{19}{10}-1-\frac{2}{5}\right)+\frac{4}{5}=1\)
\(\Rightarrow\left(\frac{7}{10}-x\right):\frac{1}{2}=\frac{1}{5}\\ \frac{7}{10}-x=\frac{1}{5}.\frac{1}{2}\\ \frac{7}{10}-x=\frac{1}{10}\\ \Rightarrow x=\frac{7}{10}-\frac{1}{10}=\frac{3}{5}\)
tim stn x biet 1/3 + 1/6 + 1/10 +...+2/x x (x - 1) = 2005/2006
tim x thỏa mãn ; |x+1| + |x-2| +|x+7| = 5x-10
Vì :
\(\left|x+1\right|\ge0\)
\(\left|x-2\right|\ge0\)
\(\left|x+7\right|\ge0\)
\(\Rightarrow\left|x+1\right|+\left|x-2\right|+\left|x+7\right|\ge0\)
\(\Rightarrow5x-10\ge0\Leftrightarrow5x\ge10\Rightarrow x\ge2\)
\(\Rightarrow x+1+x-2+x+7=5x-10\)
\(\Rightarrow3x+6=5x-10\)
\(\Rightarrow3x-5x=-10-6\)
\(\Leftrightarrow-2x=-16\)
\(\Rightarrow x=8\)
5x -10 >/ 0 => x >/ 2
tac có các | .số dương..| = nó
=> x+1 + x -2 + x+7 = 5x -10
=> x =8
x + x +1 phan 2 + x + 8 phan 10 = 136 .Tim x