150%xX+7/2xX+X=18
Thực hiện phép trừ 2 x x - 1 - x x - 1 - 1 x - 1 . Cách thực hiện nào sau đây là sai ?
A. 2 x x - 1 - x x - 1 - 1 x - 1 = 2 x x - 1 - x x - 1 - 1 x - 1 = . . .
B. 2 x x - 1 - x x - 1 - 1 x - 1 = 2 x x - 1 - x x - 1 - 1 x - 1 = . . .
C. 2 x x - 1 - x x - 1 - 1 x - 1 = 2 x x - 1 - x x - 1 + 1 x - 1 = . . .
D. 2 x x - 1 - x x - 1 - 1 x - 1 = 2 x x - 1 - - x x - 1 + - 1 x - 1 = . . .
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) \(\dfrac{3}{2}\times x-\dfrac{2}{7}\times\left(x-\dfrac{7}{2}\right)=18\)
\(\Leftrightarrow\dfrac{3}{2}\times x-\dfrac{7}{2}\times x+1=18\)
\(\Leftrightarrow\left(\dfrac{3}{2}-\dfrac{7}{2}\right)\times x+1=18\)
\(\Leftrightarrow\dfrac{17}{14}\times x=18-1\)
\(\Leftrightarrow\dfrac{17}{14}\times x=17\)
\(\Leftrightarrow x=17:\dfrac{17}{14}\)
\(\Leftrightarrow x=17\times\dfrac{14}{17}\)
\(\Rightarrow x=14\)
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 .
13x(7-x)=26 (4x-18):3=2 2xx+98x2022=98x2023 (x+1)+(X+3)+(X+5)+.....+(X+101)
a) \(13\cdot\left(7-x\right)=26\)
\(\Rightarrow7-x=\dfrac{26}{13}\)
\(\Rightarrow7-x=2\)
\(\Rightarrow x=7-2\)
\(\Rightarrow x=5\)
b) \(\left(4x-18\right):3=2\)
\(\Rightarrow4x-18=2\cdot3\)
\(\Rightarrow4x-18=6\)
\(\Rightarrow4x=6+18\)
\(\Rightarrow4x=24\)
\(\Rightarrow x=24:4\)
\(\Rightarrow x=6\)
c) \(2\cdot x+98\cdot2022=98\cdot2023\)
\(\Rightarrow2\cdot x=98\cdot2023-98\cdot2022\)
\(\Rightarrow2\cdot x=98\cdot\left(2023-2022\right)\)
\(\Rightarrow2\cdot x=98\cdot1\)
\(\Rightarrow x=\dfrac{98}{2}\)
\(\Rightarrow x=49\)
d) \(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+...+\left(x+101\right)=?\)
Thiếu đề
a) \(13.\left(7-x\right)=26\)
\(7-x=26:13\)
\(7-x=2\)
\(x=7-2\)
\(x=5\)
b) \(\left(4x-18\right):3=2\)
\(4x-18=6\)
\(4x=6+18\)
\(4x=24\)
\(x=24:4\)
\(x=6\)
Tìm x:
\(\frac{x}{5}=\frac{1}{2}-\frac{1}{5}\)
\(\frac{1}{3}+\frac{2}{3}xX=\frac{18}{21}\)
\(\frac{3}{4}xX+\frac{x}{6}=\frac{1}{6}\)
\(2xX+3\frac{1}{2}+x=24\frac{1}{4}\)
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
Cho biểu thức: A= (1+2−2√xx−12−2xx−1):(1√x+11x+1-√xx√x+1xxx+1) với x≥0,x≠1.
a Rút gọn A
b TÌm GTLN của A
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