1. 3( x - 1 ) - 2 \(\left|x+3\right|\)
= 3x - 3 - 2 ( x + 3 )
= 3x - 3 - 2x - 6
= x - 9
2. \(\left|x-3\right|\) - \(\left|4x-1\right|\)
= x - 3 - ( 4x - 1 )
= x - 3 - 4x + 1 = - 3x - 2
tìm x biết
1) |x+1|+|x-2|+|x+3|=6
2) |1-x|+3|x-3|-2|x-2|=x
3) |x+1|+|x+2|+|x+3|=4x
4) |x+1|+|x+2|+|x+3|+|x+4|=5x+1
5)||2x-3|-x+1|=4x-1
5) (x– 5)(x – 1)= (x – 1)(x – 2)
6) 6(х - 3)(х — 4) - 6х(х — 2) = 4
7)-(x + 3)(x – 4) + (x + 1)(x – 1) = 10
8) (2x – 1)(x – 2) – (x + 3)(2x – 7) =3
9) (х - 5)(4 — х) — (х — 1)(х + 3) = -2x^2
10 (4x + 1)(x – 3) - (x- 7)(4x – 1)=15
11) (x + 1)(x² – x + 1) – x(x² – 3) = 4
12) (x – 3)(x² + 3x+9)+ x(5 – x²?) = 6x
13) (3x – 5)(x + 1)– (3x – 1)(x+ 1)=x - 4
14) 5(x – 3)(x – 7)– (5x+ 1)(x – 2)= 8
cho
f(x)=4x^2-11x+8x^3+4x^4+5+2x^2 và g(x)=-5x^3-6x^2-4x^4+9+5x-3x^3.Tính
F(-1)+g(-1) và f(1)-g(1)
cho
f(x)=4x^2-11x+8x^3+4x^4+5+2x^2 và g(x)=-5x^3-6x^2-4x^4+9+5x-3x^3.Tính
F(-1)+g(-1) và f(1)-g(1)
Tìm nghiệm
D(x)=3x^3+x
E(x)=x^2-3x+2
F(x)=4x^2-4x+1
Tìm x biết
a) 3(1-4x).(x-1)+4(3x-2).(x+3)=-27
b) (x+3).(x2-3+9)-.(x-1).(x+1)=27
c) 2x2+3(x-1).(x+1)=5x.(x+1)
d) 8(x-1).(x+5)-(x+2).(x+5)=3(x-1).(x+2)
Tìm Min
x^2 +4x-5
4x^2+4x-3
x^2+x+1
2x^2+4x+8
x^2+x
a) |4-x|+2x=3
b) |x+1|+|x+2|+|x+3|=4x
c) |2x-1|=2
d) |3-2x|+|4y+5|=0
e)x^2+|x-1|=x^2+2
Cho hai đa thức f(x) = 2x3 - 4x5 + 7x2 - ( 3x -1 ); g(x) = -4x5 + 2x3 + 7x2 -12x + 3
1. Tính h(x) = f(x) - g(x)
2. Tìm x để h(x) = 2f(1)