\(\left(x-3\right)\left(x-5\right)< 0\)
\(\Rightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x-3>0\\x-5< 0\end{matrix}\right.\\\left\{{}\begin{matrix}x-3< 0\\x-5>0\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}3< x< 5\\\left\{{}\begin{matrix}x>3\\x< 5\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow3< x< 5\)
(x+5) . (x-4) = 0
(x-1) . (x-3)=0
(3-x)-(x-3)=0
x. (x+1)=0
Bài 14: Tìm x
1/ x.(x + 17) = 0
2/ (x + 1112).(x-3) = 0
3/ (-x + 25).(3 – x ) = 0
4/ x.(12 + x).( 7 – x) = 0
5/ (x - 15).(x +2).(-x -3) = 0
1) 3(x-5)(2x+9)+3x-15=0
2) (x2-16)(12-4x)=0
3) (9-x2)(4x-8)=0
4) (8-x3)(5x-125)=0
5) 4x=8
Tìm x, biết:
a) (2x -4).(x+3)=0
b) (x-5).(2:x)>0
c) 3x-5 chia hết x-1 (x thuộc Z)
d) 5( x-3) -4(5-x)=8x +3
Mọi người giúp mk nhé!
Tìm x biết
a) (x-2).(-5-x^2)>0
b) (x+4).|x+5|>0
c) (x+3).(x-4)>0
e) 2018+...+(x+1)+x=2018
1. Tìm x thuộc Z
a, ( 2x^2+4). ( x+3) > 0
b, ( x^2 + 5) .( 4 - x) < 0
c ,( x^2 - 1) .( x + 5 )=0
Tìm x biết:
3.(x-2)+5.(7-x)=11
(x - 2). (x + 3) > 0
(x + 1). (x - 3) < 0
Tìm x biết
a) ( x+ 1 ) mũ 2 ( x- 2) mũ 2 =0
b) x(x+1) (x+2) mũ 2 (x+3) mũ 3=0
c) ( x-9) mũ 5 x ( x-5) mũ 8=0
d) ( x+17) mũ 21. ( x-5) mũ 25=0
bai 2 rút gọn biểu thức
A= a.( b-c) - b.( a+c)
B=(a+b)(c-d) - (a-d ) . ( b+c)
C= ( a+3b) . c - d- ( 3 a - d) . ( b+ c) - 2c . (b-a) + 2b . ( a+d)
Tìm x biết
a) ( x+ 1 ) ngũ 2 ( x- 2) ngũ 2 =0
b) x(x+1) (x+2) ngũ 2 (x+3) ngũ 3=0
c) ( x-9) ngũ 5 x ( x-5) ngũ 8=0
d) ( x+17) ngũ 21 . ( x-5) ngũ 25=0
bai 2 rút gọn biểu thức
A= a.( b-c) - b.( a+c)
B=(a+b)(c-d) - (a-d ) . ( b+c)
C= ( a+3b) . c - d- ( 3 a - d) . ( b+ c) - 2c . (b-a) + 2b . ( a+d)
4. Tìm x,y bt
a, (x^2-1)×(x^2-4)×(x^2-7)×(x^2-10)<0
b, (x^3 +5 )×(x^3+10)×(x^3+15)×(x^3+20)<0
