(3x-13).(x-9)=0
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(3x-13).(x-9)=0
=>3x-13=0 hoặc x-9=0
=>3x=13 hoặc x=9
=>x=13/3 hoặc x=9
Vậy x E {13/3;9}
Tim so nguyen x biet:
a,x-(-24)=3
b,(x+5)-(x-9)=x+3
c,c(x+2)=0
d,(x-1)^2=0
e,x^2-3x=0
f,-13-(6-|x+1|)=24
g,26-|x+9|=-13
i,(3x-6).3=3^4
Cho biểu thức C = 2 x - 9 x - 5 x + 6 - x + 3 x - 2 - 2 x + 1 3 - x với x ≥ 0; x ≠ 4; x ≠ 9.
A. C = x - 1 x - 3
B. C = x - 1 x + 3
C. C = x + 1 x - 3
D. C = x + 1 x + 3
Cho biểu thức C = 2 x - 9 x - 5 x + 6 - x + 3 x - 2 - 2 x + 1 3 - x với x ≥ 0; x ≠ 4; x ≠ 9.
A. C = x - 1 x - 3
B. C = x - 1 x + 3
C. C = x + 1 x - 3
D. C = x + 1 x + 3
`4x=2+xx+1x<=>4x=2+3x<=>4x-3x=2<=>1x=2<=>x=2`
a. 7x+4=3x+16
b. (x+9)(3x-15)=0
c. |-5x|=2x+21
d. 3x-5 >15-x
e.\(\dfrac{x+1}{2001}+\dfrac{X+5}{2005}< \dfrac{x+9}{2009}+\dfrac{x+13}{2013}\)
a) 7x+4=3x+16\(\Leftrightarrow\)4x=12\(\Leftrightarrow\)x=3
b)(x+9)(3x-15)=0\(\Leftrightarrow\)x+9=0 hoặc 3x-15=0
\(\Rightarrow\)x\(\in\){-9;5}
c) |-5x|=2x+21
Nếu x\(\le\)0 thì -5x=2x+21\(\Leftrightarrow\)x=-3 (t/m)
Nếu x>0 thì -5x=-2x-21\(\Leftrightarrow\)x=7 (t/m)
Vậy x\(\in\){-3;7}
d) 3x-5>15-x\(\Leftrightarrow\)4x>20\(\Leftrightarrow\)x>5
e) \(\dfrac{x+1}{2001}+\dfrac{x+5}{2005}< \dfrac{x+9}{2009}+\dfrac{x+13}{2013}\)
\(\Leftrightarrow\dfrac{x+1}{2001}-1+\dfrac{x+5}{2005}-1< \dfrac{x+9}{2009}-1+\dfrac{x+13}{2013}-1\)
\(\Leftrightarrow\)\(\dfrac{x-2000}{2001}+\dfrac{x-2000}{2005}-\dfrac{x-2000}{2009}-\dfrac{x-2000}{2013}< 0\)
\(\Leftrightarrow\)(x-2000)(\(\dfrac{1}{2001}+\dfrac{1}{2005}-\dfrac{1}{2009}-\dfrac{1}{2013}\))<0
Vì \(\dfrac{1}{2001}+\dfrac{1}{2005}-\dfrac{1}{2009}-\dfrac{1}{2013}>0\) nên x-2000<0
\(\Leftrightarrow\)x<2000
2015 . ( 3x - 2016 ) = 0
231 - ( x - 6 ) = 1339 : 13
207 - 63 . 9 + 100 =?
a)
2015.(3x -2016)= 0
=> 3x - 2016 =0
=> 3x = 2016
=> x = 2016:3
x = 672
2015.(3x-2016)=0
=> 3x-2016=0
=> 3x=2016
=> x=2016:3
=> x=672
231-(x-6)=1339:13
=> 231-x+6=103
=> 237-x=103
=> x=237-103
=> x=134
207-63.9+100
= 207-567+100
= 207-(567-100)
= 207-467
= -260
tìm x :
a) (x+3)+(x+5)+.......+(x+53)=754
b)9+11+13+...+(2x+1)=1280
f)(3x-9).(x-7)=0
a, (x+3)+(x+5)+....+(x+53)=754
=> [(x+53)-(x+3):2+1].[(x+53)+(x+3)]:2=754
=> 26.(2x+56):2=754
=> 26.(2x+56)=1508
=> 2x+56= 58
=> 2x = 2
=> x=2:2
=>x=1
Giải Phương trình: 13 - x / x+3 - 6x^2 + 6 / x^4 - 8x^2 - 9 - 3x + 6 / x^2 + 5x + 6 - 2 / x -3 =0