tìm x biết: x^2-x+(2x-2)=0
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Bài 13: Tìm x biết: a) (x-2)(x-3)-D0. b) (x-3)(x-4)-0. c) (x-7)(6-x)=0. d) (x-3)(x-13)=0. The Bài 14: Tìm x biết: a) (12-x)(2-x)=0. b) (x-33)(11-x)=0. c) (21-x)(12-x)=0. d) (50-x)(x-150) =0. Bài 15: Tìm x biết: a) 2x +x = 45. b) 2x +7x = 918. c) 2x+3x 60+5. d) 11x+22x 33.2.
Tìm x biết: (x + 2)^2 - (x + 2)(x - 3) = 0
Tìm x biết :
a,(x+2)^2-(x+2)(x-3)=0
b,2x^3-4x^2+2x=0
c,(x-1)^2-(2x+1)^2=0
\(a,\Leftrightarrow\left(x+2\right)\left(x+2-x+3\right)=0\\ \Leftrightarrow5\left(x+2\right)=0\Leftrightarrow x=-2\\ b,\Leftrightarrow2x\left(x-1\right)^2=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\\ c,\Leftrightarrow\left(x-1-2x-1\right)\left(x-1+2x+1\right)=0\\ \Leftrightarrow3x\left(-x-2\right)=0\Leftrightarrow-3x\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)
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5A. Tìm x, biết: a) 8x(x - 2017) - 2x + 4034 0; b) x + x22 8 0; c) 4 - x 2( x -4)2; d) (x2 + 1)(x - 2) + 2x 4.5B. Tìm x, biết:a) x4 -16x2 0; c) x8 + 36x4 0;b) (x - 5)3 - x + 5 0; d) 5(x - 2 ) - x2 + 4 0.
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5A. Tìm x, biết:
a) 8x(x - 2017) - 2x + 4034 = 0; b)
x + x2
2 8
= 0;
c) 4 - x = 2( x -4)2; d) (x2 + 1)(x - 2) + 2x = 4.
5B. Tìm x, biết:
a) x4 -16x2 =0; c) x8 + 36x4 =0;
b) (x - 5)3 - x + 5 = 0; d) 5(x - 2 ) - x2 + 4 = 0.
a: \(8x\left(x-2017\right)-2x+4034=0\)
\(\Leftrightarrow\left(x-2017\right)\left(8x-2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\)
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Bài 2: Tìm x, biết: a) (x + 2)^2 – 2(x + 2)(x – 5) = 0. b) 2x^2 + 3x – 5 = 0. c) x + 2 ^2 x 2 + 2x^3 = 0. d) (3x-1)^2-4(x+5)^2=0
a: \(\Leftrightarrow\left(x+2\right)\left(x+2-2x+10\right)=0\)
\(\Leftrightarrow x\in\left\{-2;12\right\}\)
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Tìm x biết : a) (x+2)(x²-2x+4)-x(x²-2)=15 b) (x-4)² - (x-2)(x+2)= 6 c) x⁴-2x³+x²-2x=0
a) \(\left(x+2\right)\left(x^2-2x+4\right)-x\left(x^2-2\right)=15\)
\(\Leftrightarrow\left(x^3+2^3\right)-\left(x^3-2x\right)=15\)
\(\Leftrightarrow x^3+8-x^3+2x=15\)
\(\Leftrightarrow2x+8=15\)
\(\Leftrightarrow2x=15-8\)
\(\Leftrightarrow2x=7\)
\(\Leftrightarrow x=\dfrac{7}{2}\)
b) \(\left(x-4\right)^2-\left(x+2\right)\left(x-2\right)=6\)
\(\Leftrightarrow x^2-8x+16-\left(x^2-4\right)=6\)
\(\Leftrightarrow x^2-8x+16-x^2+4=6\)
\(\Leftrightarrow-8x+20=6\)
\(\Leftrightarrow-8x=6-20\)
\(\Leftrightarrow-8x=-14\)
\(\Leftrightarrow x=\dfrac{7}{4}\)
c) \(x^4-2x^3+x^2-2x=0\)
\(\Leftrightarrow x^3\left(x-2\right)+x\left(x-2\right)=0\)
\(\Leftrightarrow\left(x^3+x\right)\left(x-2\right)=0\)
\(\Leftrightarrow x\left(x^2+1\right)\left(x-2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)
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`(x+2)(x^2 -2x+4) -x(x^2-2)=15`
`<=> x^3 +8 - x^3 + 2x-15=0`
`<=> 2x-7=0`
`<=> 2x=7`
`<=>x=7/2`
__
`(x-4)^2 -(x-2)(x+2)=6`
`<=>x^2 - 8x+16- x^2 +4-6=0`
`<=> -8x+14=0`
`<=> -8x=-14`
`<=>x=14/8= 7/4`
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`x^4 -2x^3 +x^2-2x=0`
`<=>x(x^3-2x^2+x-2)=0`
`<=> x(x^3+x-2x^2-2)=0`
`<=>x(x(x^2+1) -2(x^2+1))=0`
`<=> x(x^2+1)(x-2)=0`
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x^2+1=0\\x-2=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)
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Tìm x biết:
(
2
x
+
2
)
(
x
-
1
)
–
(
x
+
2
)
.
(
2
x
+
1
)
0
A.
-
4
5
B.
-
1
5
C.
4...
Đọc tiếp
Tìm x biết: ( 2 x + 2 ) ( x - 1 ) – ( x + 2 ) . ( 2 x + 1 ) = 0
A. - 4 5
B. - 1 5
C. 4 5
D. 1 5
Tìm x, biết:a) 3x(x - 1) + x - 1 0;b) (x - 2)(
x
2
+ 2x + 7) + 2(
x
2
- 4) - 5(x - 2) 0;c)
(
2
x
-
1
)
2
- 25 0;d)
x
3
+ 27 + (x + 3)(x - 9) 0.
Đọc tiếp
Tìm x, biết:
a) 3x(x - 1) + x - 1 = 0;
b) (x - 2)( x 2 + 2x + 7) + 2( x 2 - 4) - 5(x - 2) = 0;
c) ( 2 x - 1 ) 2 - 25 = 0;
d) x 3 + 27 + (x + 3)(x - 9) = 0.
a) x = 1; x = - 1 3 b) x = 2.
c) x = 3; x = -2. d) x = -3; x = 0; x = 2.
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Tìm x biết: (x-3)^2-16=0
x^2 -2x=24
(2x+1)+(x+3)^2(x+7)(x-7)=0
x^2 -2x = 24
=> x^2 - 2x - 24=0
=>x^2 -8x+6x - 24 = 0
=> ( x^2- 8x)+( 6x-24) = 0
=> x(x-8) + 6(x-8) = 0
=> (x+6)(x-8)=0
=>\(\orbr{\begin{cases}x=-6\\x=8\end{cases}}\)
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\(=\frac{\left(2.5\right)^4.3^4-2^4\left(3.5\right)^2}{2^8.5^2.3^3}=\frac{2^4.3^2.5^2\left(5^2.3^2-1\right)}{2^8.5^2.3^3}=\frac{255-1}{16.3}=\frac{14}{3}\)
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Tìm x biết 2(x+3)-x^2-3x=0
x^3+27+(x+3)(x-9)=0
4x^2-25-(2x-5)(2x+7)=0
8x^3-50x=0
(2x-1)^2-25=0
Tìm x biết a) x(x-25)=0 b)2x(x-4)-x(2x-1)=-28 c)x^2 -5x=0 d)(x-2)^2-(x+1)(x+3)=-7 e)(3x+5).(4-3x)=0 f)x^2-1/4=0
a: \(x\in\left\{0;25\right\}\)
c: \(x\in\left\{0;5\right\}\)
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