a: \(\Leftrightarrow x\cdot\dfrac{-6}{5}+\dfrac{3}{5}-x^2+\dfrac{1}{2}x-\dfrac{1}{6}+x^2=0\)
\(\Leftrightarrow x\cdot\dfrac{-7}{10}=-\dfrac{13}{30}\)
hay \(x=\dfrac{13}{21}\)
b: \(\Leftrightarrow x\cdot\dfrac{1}{4}=1-\dfrac{26}{3}=\dfrac{-23}{3}\)
hay x=-23/12
c: =>3|x-1/2|=8
=>|x-1/2|=8/3
=>x-1/2=8/3 hoặc x-1/2=-8/3
=>x=19/6 hoặc x=-13/6
Tìm x,biết:
a)(3x-1).(2x+7)-(x+1).(6x- 5)=16
b)(10x+9).x-(5x-1).(2x+3)=8
c)(3x- 5).(7- 5x)+(5x+2).(3x-2)-2=0
Thu gọn các biểu thức sau :
A=2|x-3|+3|x+1|+2x-5
B=|x+7|+2|x-3|-x-4
C=8|x-1|+2|x-3|-5x-3
D=2|2-x|+3|3-x|+5x-2
Thu gọn các biểu thức sau :
A=2|x-3|+3|x+1|+2x-5
B=|x+7|+2|x-3|-x-4
C=8|x-1|+2|x-3|-5x-3
D=2|2-x|+3|3-x|+5x-2
giải các phương trình sau:
a, (5x+2)(x-7)=0
b,(2x+1)2 = (x-1)2
c,(x2-5)(x+3)=0
d, 3(x-1)(2x-1)=5(x+8)(x-1)
e, x2 -x-6=0
g, x3 + x2 +x+1=0
1) Tìm x
a) -5.(x+1/5)-1/2.(x-2/3)=3/2.x-5/6
b) 3.(x-1/2)-5.(x+3/5)=-x+1/5
c) /x/ - 38/7./x/-3/4=2./x/+(-8/7)
/x/ là giá trị tuyệt đối nhé các bn
Giúp mk vs đg cần gấp nha cảm ơn mấy bạn nhiều lắm !!!
\(\left(\frac{1}{2}\right)^5.x=\left(\frac{1}{2}\right)^7\)
\(\left(\frac{3}{7}\right)^2.x=\left(\frac{9}{21}\right)^2\)
Bài tìm x biết :
2x=2
3x=34
7x=77
(-3)x=(-3)5
(-5)x=(-5)4
2x=4
2x=8
2x=16
3x+1=32
5x-1=5
6x+4=610
52x-7=511
(-2)4x+2=64
\(\left(\frac{1}{2}\right)^x=\left(\frac{1}{2}\right)^5\)
\(\left(\frac{5}{6}\right)^{2x}=\left(\frac{5}{6}\right)^5\)
\(\left(\frac{3}{4}\right)^{2x-1}=\left(\frac{3}{4}\right)^{5x-4}\)
\(\left(-\frac{1}{10}\right)^x=\frac{1}{100}\)
\(\left(-\frac{3}{2}\right)^x=\frac{9}{4}\)
\(\left(-\frac{3}{5}\right)^{2x}=\frac{9}{25}\)
\(\left(-\frac{2}{3}\right)^x=-\frac{8}{27}\)
Tìm x
a) x-6/7 + x-7/8 + x-8/9 = x-9/10 + x-10/11+x-11/12
b) x+32/11 + x+23/12 = x+38/13 + x+27/14
c) | x-2| = 13
d) 3|x-2| + |4x-8| = |-2| - |1/3|
e) |3x-2|+5^-1 = 3 + | x- (2/3) |
f) | x+2 | + | x-2 | = 3
g) (2x-1)^2 - 5 = 20
i) (x+2)^2 = 1/2 - 1/3
k) (x-1)^3 = (x-1)
m) (x-1)^x+2 = (x-1)^2
n) (x+3)^y+1 = (2x-1)^y+1 vs y là 1 số tự nhiên .
rút gọn
a)(x-y).(x^3+x^2y+xy^2+y3)-x^4+y^4
b)(2-x).(1+2x)+(1+x)-(x^4+x^3-5x^2-5)
c)(x^2-7).(x+2)-(2x-1).(x-14)+x.(x^2-2x-22)+35
Tìm x biết
a)-15/2x+3/7=6/5x-1/2
b)x/2=3/4
c)3^8.20^5/6^8.10^2
