Khai triển hằng đẳng thức:
a) 1/27x3 - 8y6
b) t2x6 - 4/9 y4
c) 64x6 + 1/27y3
d) 1/16 a2x6 - y4
e) m4 x6 - 4/25y2
f) 27x6 - 1/64 y3
K
Khách
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Những câu hỏi liên quan
ND
Nguyễn Đức Trí
VIP
3 tháng 8 2023
a) \(\left(x-5\right)^2=\left(3+2x\right)^2\)
\(\Rightarrow\left(3+2x\right)^2-\left(x-5\right)^2=0\)
\(\Rightarrow\left(3+2x+x-5\right)\left(3+2x-x+5\right)=0\)
\(\Rightarrow\left(3x-2\right)\left(x+8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}3x-2=0\\x+8=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-8\end{matrix}\right.\)
b) \(27x^3-54x^2+36x=9\)
\(\Rightarrow27x^3-54x^2+36x-9=0\)
\(\Rightarrow27x^3-54x^2+36x-8+8-9=0\)
\(\Rightarrow\left(3x-2\right)^3-1=0\)
\(\Rightarrow\left(3x-2-1\right)\left[\left(3x-2\right)^2+3x-2+1\right]=0\)
\(\Rightarrow\left(3x-3\right)\left[\left(3x-2\right)^2+3x-2+\dfrac{1}{4}-\dfrac{1}{4}+1\right]=0\)
\(\Rightarrow\left(3x-3\right)\left[\left(3x-2+\dfrac{1}{2}\right)^2+\dfrac{3}{4}\right]=0\)
\(\Rightarrow\left(3x-3\right)\left[\left(3x-\dfrac{3}{2}\right)^2+\dfrac{3}{4}\right]=0\left(1\right)\)
mà \(\left(3x-\dfrac{3}{2}\right)^2+\dfrac{3}{4}>0,\forall x\)
\(\left(1\right)\Rightarrow3x-3=0\Rightarrow3x=3\Rightarrow x=1\)
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
3 tháng 8 2023
(\(x-5\))2 = (3 +2\(x\))2 ⇒ \(\left[{}\begin{matrix}x-5=3+2x\\x-5=-3-2x\end{matrix}\right.\) ⇒ \(\left[{}\begin{matrix}x=-8\\x=\dfrac{2}{3}\end{matrix}\right.\) vậy \(x\in\){-8; \(\dfrac{2}{3}\)}
27\(x^3\) - 54\(x^2\) + 36\(x\) = 9
27\(x^3\) - 54\(x^2\) + 36\(x\) - 8 = 1
(3\(x\) - 2)3 = 1 ⇒ 3\(x\) - 2 = 1 ⇒ \(x\) = 1
YN
2 tháng 10 2021
a) \(\left(3x-2\right)^2=\left(3x\right)^2-2.3x.2+2^2=9x^2-12x+4\)
b) \(\left(\dfrac{x}{3}+y^3\right)^2=\left(\dfrac{x}{3}\right)^2+2\dfrac{x}{3}y^3+\left(y^3\right)^2=\dfrac{x^2}{9}+\dfrac{2}{3}xy^3+y^6\)
c) \(9x^2-225=\left(3x\right)^2-\left(15\right)^2=\left(3x-15\right)\left(3x+15\right)\)
YN
2 tháng 10 2021
d) \(\left(2x-3y\right)^3=\left(2x\right)^3-3\left(2x\right)^23y+3.2x\left(3y\right)^2-\left(3y\right)^3=8x^3-3.4x^2.3y+6x.9y^2-27y^3=8x^3-36x^2y+54xy^2-27y^3\)
e) \(\left(2x^2+\dfrac{3}{2}\right)^3=\left(2x^2\right)^3+3\left(2x^2\right)^2\dfrac{3}{2}+3.2x^2\left(\dfrac{3}{2}\right)^2+\left(\dfrac{3}{2}\right)^3=8x^6+3.4x^4.\dfrac{3}{2}+6x^2.\dfrac{9}{4}+\dfrac{27}{8}=8x^6+18x^4+\dfrac{27}{2}x^2+\dfrac{27}{8}\)
f) \(\left(-2xy^2+\dfrac{1}{2}x^3y\right)^3=\left(-2xy^2\right)+3\left(-2xy^2\right)^2\dfrac{1}{2}x^3y+3\left(-2xy^2\right)\left(\dfrac{1}{2}x^3y\right)^2+\left(\dfrac{1}{2}x^3y\right)^3=-8x^3y^6+3.4x^2y^4.\dfrac{1}{2}x^3y-6xy^2.\dfrac{1}{4}x^6y^2+\dfrac{1}{8}x^9y^3=-8x^3y^6+6x^5y^5-\dfrac{3}{2}x^7y^4+\dfrac{1}{8}x^9y^3\)
CM
30 tháng 5 2017
Khi x = - 1; y = 1 thì xy = (-1).1= -1
Ta có: xy – x2y2 + x3y3 – x4y4 + x5y5 – x6.y6
= xy – (xy)2 + (xy)3 – (xy)4 + (xy)5 – (xy)6
= -1 – (-1)2 + (-1)3 – (-1)4 + (-1)5 - (-1)6
= -1 – 1 + (-1) – 1 + (-1) – 1
= - 6
Chọn đáp án D
NV
Nguyễn Việt Lâm
Giáo viên
15 tháng 12 2020
a.
\(1-4x^2=\left(1-2x\right)\left(1+2x\right)\)
b.
\(8-27x^3=\left(2\right)^3-\left(3x\right)^3=\left(2-3x\right)\left(4+6x+9x^2\right)\)
c.
\(27+27x+9x^2+x^3=x^3+3.x^2.3+3.3^2.x+3^3\)
\(=\left(x+3\right)^3\)
d.
\(2x^3+4x^2+2x=2x\left(x^2+2x+1\right)=2x\left(x+1\right)^2\)
e.
\(x^2-y^2-5x+5y=\left(x-y\right)\left(x+y\right)-5\left(x-y\right)\)
\(=\left(x-y\right)\left(x+y-5\right)\)
f.
\(x^2-6x+9-y^2=\left(x-3\right)^2-y^2=\left(x-3-y\right)\left(x-3+y\right)\)
6 tháng 8 2023
A= 8x3 - 12x2y + 12xy2 - y3 + 12x2 - 12xy + 3y2 + 6x - 3y + 11
Ta có:
8x3 - 12x2y + 12xy2 - y3 = (2x - y)3 = 93 = 729
12x2 - 12xy + 3y2 = 4x2 - 4xy + y2 + 8x2 - 8xy + 2y2
= (2x - y)2 + 2 (4x2 - 4xy + y2)
= (2x - y)2 + 2(2x - y)2
= 92 + 2.92
= 243
6x - 3y = 3(2x - y) = 3.9 = 27
Vậy A= 8x3 - 12x2y + 12xy2 - y3 + 12x2 - 12xy + 3y2 + 6x - 3y + 11 = 729 + 243 + 27 =999
Q
20 tháng 6 2017
a) \(\left(2x^3-y^2\right)^3\)
\(=\left(2x^3\right)^3-3\cdot\left(2x^3\right)^2\cdot y^2+3\cdot2x^3\cdot\left(y^2\right)^{^2}-\left(y^2\right)^3\)
\(=8x^9-3\cdot4x^6y^2+3\cdot2x^3y^4-y^6\)
\(=8x^9-12x^6y^2+6x^3y^4-y^6\)
b) \(\left(x-3y\right)\left(x^2+3xy+9y^2\right)\)
\(=x^3-\left(3y\right)^3\)
\(=x^3-27y^3\)
c) \(\left(x+2y+z\right)\left(x+2y-z\right)\)
\(=\left(x+2y\right)^2-z^2\)
\(=x^2+4xy+4y^2-z^2\)
d) \(\left(2x^3y-0,5x^2\right)^3\)
\(=\left(2x^3y-\dfrac{1}{2}x^2\right)^3\)
\(=8x^9y^3-6x^8y^2+\dfrac{3}{2}x^7y-\dfrac{1}{8}x^6\)
e) \(\left(x^2-3\right)\left(x^4+3x^2+9\right)\)
\(=\left(x^2-3\right)\left(4x^2+9\right)\)
\(=4x^4+9x^2-12x^2-27\)
\(=4x^4-3x^2-27\)
f) \(\left(2x-1\right)\left(4x^2+2x+1\right)\)
\(=\left(2x\right)^3-1^3\)
\(=8x^3-1\)
TN
20 tháng 6 2017
\(a,\left(2x^3-y^2\right)^3=8x^9-12x^6y^2+6x^3y^4-y^6\)\(b,\left(x-3y\right)\left(x^2+3xy+9y^2\right)=x^3-27y^3\)
\(c,\left(x+2y+z\right)\left(x+2y-z\right)=\left(x+2y\right)^2-z^2=x^2+4xy+4y^2-z^2\)\(d,\left(2x^3y-0,5x^2\right)^3=8x^9y^3-6x^4y^2x^2+3x^3yx^4-0,125x^6=8x^9y^3-6x^6y^2+3x^7y-0,125x^6\)
26 tháng 7 2023
a: x^3+8=(x+2)(x^2-2x+4)
b: =(3x+1)(9x^2-3x+1)
c: =(x+3)(x^2-3x+9)
d: =(4x-3y)(16x^2+24xy+9y^2)
MP
26 tháng 7 2023
\(a.x^3+8=\left(x+2\right)\left(x^2-2x+4\right)\)
\(b.27x^3+1=\left(3x+1\right)\left(9x-3x+1\right)\)
\(c.x^3+27=\left(x+3\right)\left(x^2-3x+9\right)\)
\(d.64x^3-27y^3=\left(4x-3y\right)\left(16x^2+12xy+9y^2\right)\)
CM
12 tháng 10 2017
Ta có 4 x 2 – 25 y 2 = ( 2 x ) 2 – ( 5 y ) 2 = ( 2 x – 5 y ) ( 2 x + 5 y )
Đáp án cần chọn là: C
a) Ta có: \(\frac{1}{27}x^3-8y^6\)
\(=\left(\frac{1}{3}x\right)^3-\left(2y^2\right)^3\)
\(=\left(\frac{1}{3}x-2y^2\right)\left(\frac{1}{9}x^2+\frac{2}{3}xy^2+4y^4\right)\)
b) Ta có: \(t^2x^6-\frac{4}{9}y^4\)
\(=\left(tx^3\right)^2-\left(\frac{2}{3}y^2\right)^2\)
\(=\left(tx^3-\frac{2}{3}y^2\right)\left(tx^3+\frac{2}{3}y^2\right)\)
c) Ta có: \(64x^6+\frac{1}{27}y^3\)
\(=\left(4x^2\right)^3+\left(\frac{1}{3}y\right)^3\)
\(=\left(4x^2+\frac{1}{3}y\right)\left(8x^4-\frac{4}{3}x^2y+\frac{1}{9}y^2\right)\)
d) Ta có: \(\frac{1}{16}a^2x^6-y^4\)
\(=\left(\frac{1}{4}ax^3\right)^2-\left(y^2\right)^2\)
\(=\left(\frac{1}{4}ax^3-y^2\right)\left(\frac{1}{4}ax^3+y^2\right)\)
e) Ta có: \(m^4x^6-\frac{4}{25}y^2\)
\(=\left(m^2x^3\right)^2-\left(\frac{2}{5}y\right)^2\)
\(=\left(m^2x^3-\frac{2}{5}y\right)\left(m^2x^3+\frac{2}{5}y\right)\)
f) Ta có: \(27x^6-\frac{1}{64}y^3\)
\(=\left(3x^2\right)^3-\left(\frac{1}{4}y\right)^3\)
\(=\left(3x^2-\frac{1}{4}y\right)\left(9x^4+\frac{3}{4}x^2y+\frac{1}{16}y^2\right)\)