a, (2-x)(x-\(\dfrac{1}{2}\)) > 0
=> (x-2)(x-\(\dfrac{1}{2}\)) < 0
=> x-2 và x-\(\dfrac{1}{2}\) trái dấu
Mà x-2 <x- \(\dfrac{1}{2}\)
=> x-2 <0 và x-\(\dfrac{1}{2}\) > 0
=> x < 2 và x > \(\dfrac{1}{2}\)
=> \(\dfrac{1}{2}\) < x < 2
Vậy \(\dfrac{1}{2}\) < x < 2
Tìm x:
A, (x-3)(x-2)<0
B, (2x-1)(x-2)<0
C, (x+3)(x-4)>0
D, x^2(x+1)> hoặc bằng 0
E, (3x+1)(x-2)(x^2+1)>0
TÌm x thuộc z để
a)(2x-1).(x+5)>0
b)(x^2-2).(x^2-3).(x^2-1)<0
c)(x-1).(x-2).(x-3).(x-4)>0
Tìm x biết:
A, (x+3)(x-2)<0
B, (2x-1)(x-2)<0
C, (x+3)(x-4)>0
D, x^2 (x+1)> hoặc = 0
E, (3x+1)(x-2)(x^2+1)>0
Tìm x biết :
a) | 2x - 1 | = 4
b) -3 | 2x | + | 5 - x | = 1
c) 2^x + 3 = 2^x - 1 = 15/64
d) | -3 + 5 | = x
e) ( x - 1 )^100 + ( x - y )^98 = 0
f) ( x - 7 )^x + 1 - ( x - 7 )^x + 5 = 0
Tìm x biết:
a. (x - 2).(x + 3/4) > 0
b. (2x - 5).(1 - 3x) > 0
c. (3 - 2x).(x + 1) < 0
d.(5x + 11).(7 - x) < 0
Bài 1 : Tìm x
a) 2/3 - 1/3 (x-3/2)-1/2(2x+1)=5
b) (x+1/2)(X-3/4)=0
c) 1/3 x + 3/5 (x+1)=0
d)x-8/2 > 0
e) x:(2/9 - 1/5 )=1/2
g) 1/3 + 1/2 : x = 1/5
Bài 1 : Tìm x
a) 2/3 - 1/3 (x-3/2)-1/2(2x+1)=5
b) (x+1/2)(X-3/4)=0
c) 1/3 x + 3/5 (x+1)=0
d)x-8/2 > 0
e) x:(2/9 - 1/5 )=1/2
g) 1/3 + 1/2 : x = 1/5
Tìm x,y biết :
1 ) | 4 - x | + | 2y +1 | = 0
2) | x - 3 | = | 5 - 2x |
Tìm x biết:
a, 5x+2>3x-1
b, \(\dfrac{3}{4}.x-\dfrac{1}{2}>\dfrac{1}{2}.x+\dfrac{3}{4}\)
c, (x-2).(x-3)>0
d, (2x+4)(x-5)<0
