Tìm :
|
x^2+6x+9
10x-25-x^2
8x^3-1/8
1/25x^2-64y^2
1) \(x^2+6x+9\)
\(=\left(x+3\right)^2\)
2) \(10x-25-x^2\)
\(=-25+10x-x^2\)
\(=-\left(5-x\right)^2\)
3) \(8x^3-\dfrac{1}{8}\)
\(=\left(2x\right)^3-\left(\dfrac{1}{2}\right)^3\)
\(=\left(2x-\dfrac{1}{2}\right)\left(4x^2+x+\dfrac{1}{4}\right)\)
4) \(\dfrac{1}{25}x^2-64y^2\)
\(=\left(\dfrac{1}{5}x\right)^2-\left(8y\right)^2\)
\(=\left(\dfrac{1}{5}x+8y\right)\left(\dfrac{1}{5}x-8y\right)\)
\(x^2+6x+9=\left(x+3\right)^2\)
\(10x-25-x^2=-\left(x-5\right)^2\)
\(8x^3-\dfrac{1}{8}=\left(2x-\dfrac{1}{2}\right)\left(4x^2+x+\dfrac{1}{4}\right)\)
tìm x :\(\frac{x+14}{200}+\frac{x+27}{187}+\frac{x+105}{109}=\frac{x+200}{14}+\frac{x+187}{27}+\frac{x+109}{105}\)
\(\left(\frac{x+14}{200}+1\right)+\left(\frac{x+27}{187}+1\right)+\left(\frac{x+105}{109}+1\right)=\left(\frac{x+200}{14}+1\right)\)
\(+\left(\frac{x+187}{27}+1\right)+\left(\frac{x+109}{105}+1\right)\)
\(\Rightarrow\frac{x+214}{200}+\frac{x+214}{187}+\frac{x+214}{109}-\frac{x+214}{14}-\frac{x+214}{27}-\frac{x+214}{105}=0\)
\(\Rightarrow\left(x+214\right)\left(\frac{1}{200}+\frac{1}{187}+\frac{1}{109}-\frac{1}{14}-\frac{1}{27}-\frac{1}{105}\right)=0\)
Mà \(\frac{1}{200}+\frac{1}{187}+\frac{1}{109}-\frac{1}{14}-\frac{1}{27}-\frac{1}{105}\ne0\)
\(\Rightarrow x+214=0\)
\(\Rightarrow x=-214\)
Vậy x = -214
Tìm x bt
a) (x-5) + (x-7) = -12
b) 3x - 44 = -109 -2x
c) 2 ( x-5) - 5 (3+x) =-109
d) (x-3) . (x+5 ) < 0
\(a.\)
\(\Leftrightarrow x-5+x-7=-12.\)
\(\Leftrightarrow x=-12+-12\)
\(\Leftrightarrow x=-24\)
\(b.\)
\(\Leftrightarrow3x+2x=-109+44\)
\(\Leftrightarrow5x=-65\)
\(\Rightarrow x=-13\)
\(c.\)
\(\Leftrightarrow2x-10-15+5x=-109\)
\(\Leftrightarrow2x-5x=-109+15+10\)
\(\Leftrightarrow3x=-84\)
\(\Rightarrow x=-28\)
\(d.\)
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d) \(\left(x-3\right)\left(x+5\right)< 0\)
\(\Leftrightarrow\orbr{\begin{cases}x-3< 0\\x+5< 0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x< 3\\x< -5\end{cases}}\)
Tìm x biết x*109-x*8-x=1200
Tìm x biết x nhân 109- x nhân 8 - x = 1200
x nhan 109 - x nhan 8 - x = 1200
x nhan 109 - x nhan 8 - x nhan 1 = 1200
x nhan (109 - 8 - 1) = 1200
x nhan 100 = 1200
x = 1200 : 100
x = 12
Vay x = 12
Câu 3. Có thể chuyển biểu thức 109 x 7 + 109 x 3 thành biểu thức: *
A. 7 x 109 + 3
B. 109 x 3 + 7
C. 109 x 7 + 3
D. 109 x (7 + 3)
Tìm số x thỏa mãn x : 109 = 215 ?
A. 23035
B. 13435
C. 23435
D. 33435
Cho 2 đa thức: P(x)=\(x^{109}+ax^{81}+bx^{47}+cx^{25}+dx^{11}+2x+1\)
Q(x) =\(x^{109}+ax^{81}+bx^{47}+cx^{25}+dx^{11}+Mx-N\)
Tìm cặp số (M,N) biết rằng:P(x) : (x – 1)dư – 2 ;P(x): (x – 2) dư 3.
Q(x) chia hết cho (x – 1)(x – 2)
mong mọi người giúp đỡ cảm ơn nhiều
Tìm x
2 . ( x - 7 )- 3 . ( 5 - x ) = -109
2.(x-7)-3.(5-x)=-109
=>2x-14-15+3x=-109
=>5x-29=-109
=>5x=-80
=>x=-16