tìm x
X^2+3.(x- 1/2)=x^2+3
Bài 1 : Tìm X
X/-2 = -18/X
X/2 + X/5 = 17/10
Bài 2 : Tính ( tính nhanh nếu có thể )
2 mũ 5 . 9 - 2 mũ 6 / 32.5 + 25. 3 mũ 2
Bài 3 : Tìm số nguyên X biết :
5/21 + -3/7 < X/21 < -2/7 + 8/21
Giúp nhanh đang gấp ạ!!!
Bài 1:
a: x/-2=-18/x
=>x2=36
=>x=6 hoặc x=-6
b: x/2+x/5=17/10
=>7/10x=17/10
hay x=17/7
Tìm X
x- 2/3 x (x+9) =1
\(x-\dfrac{2}{3}.\left(x+9\right)=1\)
\(\Rightarrow x-\dfrac{2}{3}x-6=1\)
\(\Rightarrow\dfrac{1}{3}x=7\)
\(\Rightarrow x=21\)
\(x-\dfrac{2}{3}\times\left(x+9\right)=1\)
\(x-\dfrac{2}{3}x-6=1\)
\(\dfrac{1}{3}x-6=1\)
\(\dfrac{1}{3}x=1+6\)
\(\dfrac{1}{3}x=7\)
\(x=7:\dfrac{1}{3}\)
\(x=21\)
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`
\(x\cdot\dfrac{6}{7}=\dfrac{5}{14}\)
\(x\) \(=\dfrac{5}{14}:\dfrac{6}{7}\)
\(x\) \(=\dfrac{5}{12}\)
\(x:\dfrac{2}{3}=\dfrac{4}{9}\)
\(x\) \(=\dfrac{4}{9}\cdot\dfrac{2}{3}\)
\(x\) \(=\dfrac{8}{27}\)
\(x-\dfrac{1}{4}=\dfrac{3}{2}\)
\(x\) \(=\dfrac{3}{2}+\dfrac{1}{4}\)
\(x\) \(=\dfrac{7}{4}\)
\(x+\dfrac{4}{5}=\dfrac{8}{9}\)
\(x\) \(=\dfrac{8}{9}-\dfrac{4}{5}\)
\(x\) \(=\dfrac{4}{45}\)
Tìm X biết 1/3+1/6+1/10+...+2/Xx(X x 2)=1999/2001
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
tìm x
x+1/6=-3/8
-3/7-x=4/5+-2/3
a, \(x + 1/6 = -3/8 \)
\(x = -3/8 - 1/6\)
\(x = -13/24\)
Vậy \(x = -13/24\)
b, \(-3/7 - x = 4/5 - 2/3\)
\(-3/7 - x = 2/15\)
\(x = -3/7 - 2/15\)
\(x = -59/105.\)
Vậy \(x = -59/105\)
x+1/6=-3/8
x=-3/8-1/6
x=-13/24
-3/7-x=4/5+-2/3
-3/7-x=2/15
x=-3/7-2/15
x=-59/105
Cho biểu thức :
Q= (√x+1√x−2−2√x√x+2+5√x+24−xx+1x−2−2xx+2+5x+24−x ) : 3√x−xx+4√x+43x−xx+4x+4
a, Rút gọn Q
b, Tìm x để Q=2
c, Tìm các giá trị của x để Q có giá trị âm
Tìm giới hạn F = lim x → + ∞ 3 sin x + 2 cos x x + 1 + x :
A. +∞
B. -∞
C. 5/2
D. 0
Tìm x:
\(\frac{x}{5}=\frac{1}{2}-\frac{1}{5}\)
\(\frac{1}{3}+\frac{2}{3}xX=\frac{18}{21}\)
\(\frac{3}{4}xX+\frac{x}{6}=\frac{1}{6}\)
\(2xX+3\frac{1}{2}+x=24\frac{1}{4}\)