\(2x\left(2x-6\right)\left(3x-15\right)\left(x^2+1\right)=0\)
=> TH1: \(2x=0\Rightarrow x=0\)
TH2: \(2x-6=0\Rightarrow2x=6\Rightarrow x=3\)
TH3: \(3x-15=0\Rightarrow3x=15\Rightarrow x=5\)
TH4: \(x^2+1=0\Rightarrow x^2=-1\) ( vô lý => loại )
Vậy: x = 0 hoặc x = 3 hoặc x = 5
tìm x
( 3x - 15 )(10 - x)<0
( 2x - 8 ) (6 - x )≥0
( 15 - 5x ) ( 2x - 4)<0
Bài 1: Tìm x [GIÚPPPPPPPPPPPPPPPPPPP]
1) 5 – (10 – x) = 7
2) - 32 - (x – 5) = 0
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) = 0
Tim X
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) =
Tìm x :
a) -(x+84) + 214 = -16
b) 2x - 15 = 40 - ( 3x+10)
c) |-x-2 | - 5 =3
d) ( x-2 )(x2 + 1) = 0
Tìm x a) x.(2x+6)=0 b) (x-3).(-3x+15)=0 c) x ngũ 2 - 4x=0
1,x=3x2
2,(x+5)(x-3)-(x-30)=0
3,(2x-6)(x+4)+2(2x-6)=0
4,(2x-5)(x+9)+6x-15=0
3,(2x-5)(x+6)+8x-20=0
Tìm x biet:
a,5/2x+x=32/15
b,x-7/2x=-32/15
c,-7/3x-7/4x+11/3=18/5
d,-5/6-3x=2/3
e,2x-5/9=-2/3
f,1/2-2/3x=7/12
g,7-|2x-3|=4
h,(19x+2.5^2):14=(13-8)^2-4^2
i,3/4x-2/3=2/7.1/6+5/7.1/6
k,(x+1/2).(2/3-2x)=0
l,x/2013-1/10-1/15-1/21-........-1/120=5/8
B1: Tìm x:
1/ \(\dfrac{x+3}{15}\) = \(\dfrac{1}{3}\) - \(\dfrac{1}{15}\)
2/ (2x - 5) = (x - 3) = 0
3/ (3x - 4) - (2x - 5) = 3
4/ (2x + 1) x (\(\dfrac{1}{2}\)x - 1) = 0
Tìm các tập hợp con của tập hợp A chứa x biết 2x (2x-6) (3x-15) (x2+1)= 0
