tim x
x+1/2=8/x+1
tim x;y de -xx(2-y)=10 (1-x)x(1+y)=-15
rút gọn:
1. 2√3−6√8−223−68−2
2. x2+√xx−√x+1−2x+√x√xx2+xx−x+1−2x+xx
3. x√x−1−2x−√xx−√x
Tim X
a,X - 20/11 x 13 - 20/13 x 15 - 20/15 x 17 -...-20/53 x 55 = 3/11
b,1/21 + 1/28 +1/36 + ... +2/Xx(x + 1) = 2/9
Ta có : A=20/11×13 + 20/13×15 +20/15×17+...+20/53×55
A = 10 ×( 2/11×13+2/13×15+...12/53×55)
A = 10 ×(1/11-1/13+1/13-1/15+1/15-1/17+...+1/53-1/55)
A = 10 × (1/11-1/55)
A =10 × 4/55
A = 8/11
tim nghiem da thuc
3xx+x
xx-5x-6
2xx+10x-12
xxx-xx+x-1
3xx+x = 0
xx-5x-6 = -6
2xx+ 10x -12 = -12
xxx-xx+x -1 =-1
tim x thuoc n va x>2 de
x(x-1) .x(x-1)=(x-2)xx(x-1)
x(x - 1)(x - 1) = (x - 2)xx(x - 1)
<=> x(x - 1)x(x - 1) - (x - 2)xx(x - 1) = (x - 2)xx(x - 1) - (x - 2)xx(x - 1)
<=> x(x - 1)x(x - 1) - (x - 2)xx(x - 1) = 0
<=> x2(x - 1) = 0
<=> x = 0
<=> x - 1 = 0
x = 0 + 1
x = 1
=> x = 0 hoặc 1
Giải các phương trình sau:
1) 2 1 5 x 2) 2 1 5 x x
3) 3 1 2 x x 4) 3 2 2 x x
5) 2 1 5 x x 6) 3 2 x x
7) 2 3 2 1 x x 8) 2 1 4 1 0 x x 2
9) 2 5 4 3 1 1 2
3 2 3 1
x x
x x x x
10) 1 7 3 2
3 3 9
x x x
x x x
11) 5 296 2 1 3 1
16 4 4
x x
x x x
12)
2 4
1
2 1 2 1 2 1 2 1
x x
x x x x
13) 2 1 2 2
2 2
x
x x x x
14) 22 4
2 6 2 2 2 3
1.tìm x
X x 6/7=5/14 X : 2/3=4/9
X-1/4=3/2 X+4/5=8/9
`x xx 6/7=5/14`
`=>x=5/14:6/7`
`=>x=5/14xx7/6`
`=>x=35/84`
`=>x=5/12`
Vậy `x=5/12`
__
`x:2/3=4/9`
`=>x=4/9xx2/3`
`=>x=8/27`
Vậy `x=8/27`
__
`x-1/4=3/2`
`=>x=3/2+1/4`
`=>x=6/4+1/4`
`=>x=7/4`
Vậy `x=7/4`
__
`x+4/5=8/9`
`=>x=8/9-4/5`
`=>x=40/45-36/45`
`=>x=4/45`
Vậy `x=4/45`
\(x\cdot\dfrac{6}{7}=\dfrac{5}{14}\)
\(x\) \(=\dfrac{5}{14}:\dfrac{6}{7}\)
\(x\) \(=\dfrac{5}{12}\)
\(x:\dfrac{2}{3}=\dfrac{4}{9}\)
\(x\) \(=\dfrac{4}{9}\cdot\dfrac{2}{3}\)
\(x\) \(=\dfrac{8}{27}\)
\(x-\dfrac{1}{4}=\dfrac{3}{2}\)
\(x\) \(=\dfrac{3}{2}+\dfrac{1}{4}\)
\(x\) \(=\dfrac{7}{4}\)
\(x+\dfrac{4}{5}=\dfrac{8}{9}\)
\(x\) \(=\dfrac{8}{9}-\dfrac{4}{5}\)
\(x\) \(=\dfrac{4}{45}\)
Tim X :
a/ XX- 2X *2 =41
b/ 5X * 3 + XX=276
Nhanh lên nhé các bạn ai nhanh nhất mình sẽ cho 1 k
tim x:(x+1)^2/8=8/x+1
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\\ \Rightarrow\left(x+1\right)^2\left(x+1\right)=8\cdot8\\ \left(x+1\right)^3=64\\ \left(x+1\right)^3=4^3\\ \Rightarrow x+1=4\\ x=3\)
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\)
\(\Leftrightarrow\left(x+1\right)^3=64=4^3\)
\(\Leftrightarrow x+4=1\Rightarrow x=3\)
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\)
=>\(\left(x+1\right)^2\left(x+1\right)=8.8\)
=>\(\left(x+1\right)^3=64\)
=>\(\left(x+1\right)^3=4^3\)
=>\(x+1=4\)
=>\(x=3\)
1/1x3 + 1/1x35 + 1/5x7 ............+1/xx(x+2)=8/7
CÁC BẠN ƠI 1 CHỮ x là nhân một chữ x la x nhé !