|x+4| +|x-2|-|x-4|=3 (1)
* TH1: x ≤ - 4
(1) <=> -x-4-x+2+x-4=3
<=> x=-9 (TMĐK)
*TH2: -4<x<2
(1) <=> x+4-x+2+x-4=3
<=> x=1 (TMĐK)
*TH3: 2<x<4
(1) <=> x+4+x-2+x-4=3
<=> x= 5/3 (TMĐK)
*TH4: x ≥ 4
(1) <=> x+4+x-2-x+4=3
<=> x= - 3 (KTMĐK)
Vậy x ∈ { -9;1;5/3}
&Chúc bạn học tốt :>
1 tim x
x -7 =-5
128 -3 x(x + 4) = 23
tim so nguyen x biet 17-x=7-6x
1 . tim x
71 -( 33 + x ) = 36 200 - (2x + 6) = 43
( x+ 7) -26 = 76 2 ( x - 51) = 2x23+ 20
45 -( x+ 9) = 6
140 :(x -8) = 7
2x-49=5 x 32
Mong cac ban giup minh
Tim So x khong am Biet
\(2\sqrt{x}=14\)
a) 42 : 24 + 1/4 x 24 =
b) X2 x X/y : y =
c) X x ( X + 1 ) =
d) X2 x ( X + 1 ) - X3 =
e) X2 - X x ( X x 2 ) =
giải phương trình sau :
\(\sqrt{x}+\sqrt[4]{x\text{(}1-x\text{)}^2}+\sqrt[4]{\text{(}1-x\text{)}^3}=\sqrt{1-x}+\sqrt[4]{x^3}+\sqrt[4]{x^2.\text{(}1-x\text{)}}\)
x3-6x+9x-2=0
-x4+2x3+4x2-7x+2=0
(x-2)(x2+3x+1)=x2-4
(x2+5x)2-2(x2+5x)-24=0
(4+x)2-(x-1)3=(1-x)(x2-2x+17)
(4x+3)2(x+1)(2x+1)=810
1. 13-(x-5)=8 8. (x-5)^6=(x-5)^8
2. 8-(x-10)=23-(-4+12) 9. (3-x).(x-3)=0
3. 134-5(x+4)=34 10. -32-(x-5)=0
4. |5-x|=7
5. 20+8.(x+3)=5^2.4
6. 42x=39.42-37.42
7. |x|=2-(-7)
xét tính chẵn lẻ của hàm số
a) f(x) = x2 + 3x4
b) f (x)= x3 + 3x
c) f (x)= -2x4 + x2 -1
d) f(x) =x3 + 3x +2
e) f(x) = 2x4 + x + 1
f) f (x) = \(\frac{2x^2-4}{x}\)
