|x + 1| + |x + 2| = 1 (1)
*Với x < -2
PT (1) <=> -x - 1 - x - 2 = 1
<=> -2x - 3 = 1
<=> -2x = 4
<=> x = -2 (Ko t/m đk)
*Với -2 ≤ x < -1
PT (1) <=> -x - 1 + x + 2 = 1
<=>. 0x + 1 = 1
<=> 0x = 0 (đúng với mọi x)
Mà: -2 ≤ x < -1
=> x = -2
*Với x ≥ -1
PT (1) <=> x + 1 + x + 2 = 1
<=> 2x + 3 = 1
<=> 2x = -2
<=> x = -1 (t/m ĐK)
Vậy x ∈ {-1; -2}
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
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,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. 2*|x-1|-|1-x|=12
b. 2^x+2^x+3=144
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:
4(x-1) - 3(x+2) = 3(x-4) - 2(2x + 1)
24. Tìm x∈Z biết:
a) ( x + 1) + ( x + 3) + ( x + 5 ) + …+ ( x + 99) = 0
b) ( x – 3) + ( x - 2) + ( x – 1 ) + …+ 10 + 11 = 11
c) x+(x+1)+(x+2)+...+2018+2019=2019
