Ta có: \(x+2⋮x-1\)
\(\Leftrightarrow x-1+3⋮x-1\)
Mà \(x-1⋮x-1\)
Nên \(3⋮x-1\Rightarrow x-1\inƯ_{\left(3\right)}=-3;-1;1;3\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=-3\\x-1=-1\\x-1=1\\x-1=3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=0\\x=2\\=4\end{matrix}\right.\)
Vậy: \(x=-2;0;2;4\) thì \(x+2⋮x-1\)
tìm x
\(\dfrac{-4}{x-1}\) \(\dfrac{3}{x-1}\) \(\dfrac{2x+1}{x-3}\) \(\dfrac{x+3}{x-2}\)
\(\dfrac{4x-1}{3-x}\) \(\dfrac{3x+3}{x-1}\) \(\dfrac{x-2}{x+3}\) \(\dfrac{2x}{x-2}\)
tìm x thuộc z bt :
a) 4(x+1)-(3x+1)=14
b)-2(x-1)-(2-3x)=2.(x+1)-4
c)-(x-3)+(4x-1)-14=2(x-2)-5
1.tìm x,y ∈ Z
a,xy-5x-55y=0
b,xy=x+y
2.tìm x,y∈Z
a,(x+2).(y-1)=3
b,(3-x).(xy+5)=-1
c,(x+1).(y-2)=2
d,(x-7).(y+2)=0
e,|x+1|.|y+1|=2
g,xy-x-y=2
3.tìm x ∈Z
a,251.(25-x2)=0
b,34.x2-34.49=0
c,x3-x=0
d,81x-x3=0
Tìm x , biết :
( x - 1 ) ( x ^ 2 + 2 ) = 0
( x + 1 ) + ( x + 3 ) + ( x + 5 ) + ............. + ( x + 99 ) = 0
Tìm x, biết :
a) x. (x + 2)= 0
b) (x - 3).( 4 - x )
c) x^2= 2x
d) (x - 5 ). ( x^2 + 1 ) =0
e) -12. ( x - 5 ) + 7 . ( 3 - x )=5
g) 30. ( x +2) + 6. ( x - 5 ) - 24x= 102
h) ( x + 1 ) + (x + 2 ) + ... + ( x + 99) =0
tìm x biết:
a. 2*|x-1|-|1-x|=12
b. 2^x+2^x+3=144
Tìm x biết
a,2/3.x+1/3=1/5
b,4/5- 5/3.x=-2
c,1/5+5/3:x=1/2
d,5/7:x-3=-2/7
1/tìm x
a)x-2 là ước của 3x-13
b)-15.(x-2) + 7.(3-x)=7
c)(2x+1)^2=6
d)4.(5-x)-3.(1-x)=3^2
Tìm x€ z
A, 4.(x-1)-3.(x-2)=-|-5|
B, -4.(x+1)+8.(x-3)=24
C, 12.(x-4)+6.(x-2)-16.(x+3)=7.|-4|
D, 3.|x-6|+7x-2=|x-6|+7x
E, |x+2|-6.(x-4)=20-6x
