2xx+x/2=10.x=?
2xX+X:0,125=10
2xX+X:0,125=10
2xX+Xx1/8=10
Xx(2+1/8)=10
Xx2,125=10
X=10:2,125
X=80/17
x:0,125=10-2xX
X =1,25-0,25xX
x+0,25xX=1,25
x =1
có đúng không?
Cho biểu thức sau .Với giá trị nào của x thì A > 1
P = x x - 2 x - x + 2 x x - 3 x - 2 + x x + 2 x - x - 2 x x - 3 x + 2
A. x > 1
B. x ≤ 1
C. x > 1 x ≠ 4
D. x<4
Chọn đáp án C.
Điều kiện x ≥ 0 ; x ≠ 1 ; x ≠ 4 .
Cho biểu thức sau .Với giá trị nào của x thì A > 1
P = x x - 2 x - x + 2 x x - 3 x - 2 + x x + 2 x - x - 2 x x - 3 x + 2
A. x > 1
B. x ≤ 1
C. x > 1 x ≠ 4
D. x<4
Chọn đáp án C.
Điều kiện x ≥ 0 ; x ≠ 1 ; x ≠ 4 .
Tìm X
88-3x(10+2xX)=34
a)1/2xX+3/2=7
b)3/2xX-2/7x(X-7/2)=18
`1/2 xx x +3/2 =7`
`=> 1/2 xx x = 7-3/2`
`=> 1/2 xx x = 14/2 -3/2`
`=> 1/2 xx x = 11/2`
`=> x= 11/2 :1/2`
`=> x=11/2 xx2`
`=> x= 22/2`
`=>x=11`
Vậy `x=11`
__
`3/2 xx x -2/7 xx(x-7/2)=18`
`=> 3/2 xx x -2/7x + 1=18`
`=> (3/2 -2/7 )x+ 1 =18`
`=> 17/14 x=18-1`
`=> 17/14x=17`
`=>x=17:17/14`
`=> x=17 xx 14/17`
`=>x=14`
a) \(\dfrac{1}{2}\times x+\dfrac{3}{2}=7\)
\(\dfrac{1}{2}\times x=7-\dfrac{3}{2}\)
\(\dfrac{1}{2}\times x=\dfrac{11}{2}\)
\(x=\dfrac{11}{2}\div\dfrac{1}{2}\\ x=\dfrac{11}{2}\times2\\ x=\dfrac{22}{2}=11\)
b) \(\dfrac{3}{2}\times x-\dfrac{2}{7}\times\left(x-\dfrac{7}{2}\right)=18\)
\(\dfrac{3}{2}\times x-\left(\dfrac{2}{7}x-1\right)=18\)
\(\dfrac{3}{2}\times x-\dfrac{2}{7}x+1=18\)
\(\dfrac{3}{2}x-\dfrac{2}{7}x+1=18\)
\(\dfrac{17}{14}x+1=18\)
\(\dfrac{17}{14}x=18-1\)
\(\dfrac{17}{14}x=17\)
\(x=17\div\dfrac{17}{14}\)
\(x=17\times\dfrac{14}{17}\)
\(x=14\)
a) \(\dfrac{1}{2}\times x+\dfrac{3}{2}=7\)
\(\Leftrightarrow\dfrac{1}{2}\times x=7-\dfrac{3}{2}\)
\(\Leftrightarrow\dfrac{1}{2}\times x=\dfrac{11}{2}\)
\(\Leftrightarrow x=\dfrac{11}{2}:\dfrac{1}{2}\)
\(\Leftrightarrow x=\dfrac{11}{2}\times\dfrac{2}{1}\)
\(\Rightarrow x=11\)
b) \(\dfrac{3}{2}\times x-\dfrac{2}{7}\times\left(x-\dfrac{7}{2}\right)=18\)
\(\Leftrightarrow\dfrac{3}{2}\times x-\dfrac{7}{2}\times x+1=18\)
\(\Leftrightarrow\left(\dfrac{3}{2}-\dfrac{7}{2}\right)\times x+1=18\)
\(\Leftrightarrow\dfrac{17}{14}\times x=18-1\)
\(\Leftrightarrow\dfrac{17}{14}\times x=17\)
\(\Leftrightarrow x=17:\dfrac{17}{14}\)
\(\Leftrightarrow x=17\times\dfrac{14}{17}\)
\(\Rightarrow x=14\)
b)0,5xx+2/3xx+2/3=7/12
c)3/5-2/15:x=1/2
d)50%xx-2va1/2=2va5/6
e)(2va4/5xx-50):2/3-51
f)(4va1/2-2xx)x3va2/3=11/15
g)02/5-(2va1/2xx-3):15=1/10
h)(3/4+x)x1/1+5va1/6-1va1/6
b)0,5xx+2/3xx+2/3=7/12
c)3/5-2/15:x=1/2
d)50%xx-2va1/2=2va5/6
e)(2va4/5xx-50):2/3-51
f)(4va1/2-2xx)x3va2/3=11/15
g)02/5-(2va1/2xx-3):15=1/10
h)(3/4+x)x1/1+5va1/6-1va1/6
Cho biểu thức A = x + 1 x − 2 + 2 x x + 2 + 2 + 5 x 4 − x với x ≥ 0; x ≠ 4.
A. A = 3 x x + 2
B. A = x x + 2
C. A = 2 x x + 2
D. A = 3 x + 2
1/2xX+3/5x(X-2)=3 X=?