Ta có:(x-3)(x2+3x+9)-x(x2-4)=1
=> x3-27-x3+4x=1
=>4x=28=>x=7
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Bài 2: Tìm x, biết: a) (x+2)(x² -2x+4)-x(x²+2)=15 b) (x-2)³-(x-4)(x² + 4x+16) + 6(x+1)=49 c) (x - 1)³ + (2 - x)(4 + 2x + x²)+ 3x(x + 2) = 16 d) (x - 3)³ - (x - 3)(x² + 3x + 9) + 9(x + 1)² = 15
Bài 2: Tìm x biết:1,x^2+4x+4252,(5-2x)^2-1603,(x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^2154,3(x+2)^2+(2x-1)^2-7(x-3)9x+3)365,(x-3)(x^2+3x+9)+x(x+2)(2-x)16,(2x+1)^2-4(x+2)^297,(x+3)^{^{ }2}-(x-4)(x+8)1
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Bài 2: Tìm x biết:
1,x\(^2\)+4x+4=25
2,(5-2x)\(^2\)-16=0
3,(x-3)\(^3\)-(x-3)(x\(^2\)+3x+9)+9(x+1)\(^2\)=15
4,3(x+2)\(^2\)+(2x-1)\(^2\)-7(x-3)9x+3)=36
5,(x-3)(x\(^2\)+3x+9)+x(x+2)(2-x)=1
6,(2x+1)\(^2\)-4(x+2)\(^2\)=9
7,(x+3)\(^{^{ }2}\)-(x-4)(x+8)=1
Tìm x, biết :
a) (x-2)3 +6(x+1)2-x3+12=0
b) (x-5) (x+5) - (x+3)2+3(x-2)2=(x+1)2- (x+4)(x-4)+3x2
c) (2x+3)2 +(x-1)(x+1)=5(x+2)2-(x-5)(x+1)+(x+4)
d) (1-3x)2-(x-2)(9x+1)=(3x-4)(3x+4)-9(x+3)2
Giúp mk với ạ, mk cảm ơn !
Tìm x, biết:
a) (5x – 1)(x + 1) – 2(x – 3)2 = (x + 2)(3x – 1) – (x + 4)2 + (x2 – x).
b) (1 – 3x2) – (x – 2)(9x + 1) = (3x – 4)(3x + 4) – 9(x + 3)2.
Tìm x biết:a)
(
x
–
3
)
3
–
(
x
–
3
)
(
x
2
+
3
x
+
9
)
+
9
(...
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Tìm x biết:
a) ( x – 3 ) 3 – ( x – 3 ) ( x 2 + 3 x + 9 ) + 9 ( x + 1 ) 2 = 15;
b) x(x – 5)(x + 5) – (x + 2)( x 2 - 2x + 4) = 3.
Tìm x biết:
a) 5x (x-3) = (x-2) (5x -1) - 5
b) (x-5) (x-4) - (x+1) (x-2) = 7
c) (3x-4) (x-2) = 3x (x-9) - 3
Tìm x, biết:a)
(
x
+
3
)
2
+ (4 - x)(x + 4) 1;b)
(2 - x)
3
+(3 +x)(9 - 3x +
x
2
) + 6x(1 - x) 17;c)
x
4
- 2
x
2
+1 0.
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Tìm x, biết:
a) ( x + 3 ) 2 + (4 - x)(x + 4) = 1;
b) (2 - x) 3 +(3 +x)(9 - 3x + x 2 ) + 6x(1 - x) = 17;
c) x 4 - 2 x 2 +1 = 0.
Tìm x biết :
a) x^2 - 3x + 2 (x-3) = 0
b) (x-1)(x+1) + x (x-9) = 2x^2 - 4
c) x (x-3) - 3x + 9 = 0
d) x (x+2) - (x-3)(x+3) = 5
đ) 2x (x+1) - (2x+1)(x-3) = 6
Tìm x biết :
a) (x+2)2+(x-3)2 = 2x(x+7)
b) (x+3)(x2-3x+9) = x(x2+4)-1