25a^2b^2 - 4x^2 + 4x - 1
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a) \(2a^2x-5by-5a^2y+2by\)
\(=3\left(\frac{2}{3}a^2x-\frac{5}{3}a^2y\right)-3by\)
\(=3\left(\frac{2}{3}a^2x-\frac{5}{3}a^2y-by\right)\)
\(25a^2b^2-4x^2+4x-1\)
\(=\left(5ab\right)^2-\left(4x^2-4x+1\right)\)
\(=\left(5ab\right)^2-\left[\left(2x\right)^2-2.2x.1+1^2\right]\)
\(=\left(5ab\right)^2-\left(2x-1\right)^2\)
\(=\left(5ab-2x+1\right)\left(5ab+2x-1\right)\)
bn có chép sai dấu các hạng tử ko vậy ,mk nghĩ bn chép sai dấu của hạng tử 1
\(=\left(4x^2-4xy+y^2\right)-\left(25a^2-10a+1\right)=\left(2x-y\right)^2-\left(5a-1\right)^2\)
\(=\left(2x-y-5a+1\right)\left(2x-y+5a-1\right)\)
\(=\left(4x^2-4xy+y^2\right)-\left(25a^2-10a+1\right)\\ =\left(2x-y\right)^2-\left(5a-1\right)^2\\ =\left(2x-y-5a+1\right)\left(2x-y+5a-1\right)\)
5.
\(4x^5y^2+8x^4y^3+4x^3y^4=4x^3y^2(x^2+2xy+y^2)\)
\(=4x^3y^2(x+y)^2\)
9.
\(4x^5y^2+16x^4y^2-6x^3y^2=2x^3y^2(2x^2+4x-3)\)
13.
\(-3x^4y+6x^3y-3x^2y=-3x^2y(x^2-2x+1)=-3x^2y(x-1)^2\)
17.
\(8x^3-8x^2y+2xy^2=2x(4x^2-4xy+y^2)\)
\(=2x[(2x)^2-2.2x.y+y^2]=2x(2x-y)^2\)
21.
\((a^2+4)^2-16a^2b^2=(a^2+4)^2-(4ab)^2\)
\(=(a^2+4-4ab)(a^2+4+4ab)\)
25.
\(100a^2-(a^2+25)^2=(10a)^2-(a^2+25)^2\)
\(=(10a-a^2-25)(10a+a^2+25)\)
\(=-(a^2-10a+25)(a^2+10a+25)=-(a-5)^2(a+5)^2\)
29.
\(25a^2b^2-4x^2+4x-1=25a^2b^2-(4x^2-4x+1)\)
\(=(5ab)^2-(2x-1)^2=(5ab-2x+1)(5ab+2x-1)\)
\(4x^2-4xy+y-25a^2+10a-136\)
\(\text{Phân tích thành nhân tử}\)
\(-\left(4xy-y-4x^2+25a^2-10a+136\right)\)
k nhé !
a. y4 - 14y2 + 49
Gọi y2 là t, ta có:
t2 - 14t + 49
<=> t2 - 14t + 72
<=> (t - 7)2
Thay x2 = t
<=> (x2 - 7)2
b. \(\dfrac{1}{4}-x^2\)
\(\Leftrightarrow\left(\dfrac{1}{2}\right)^2-x^2\)
\(\Leftrightarrow\left(\dfrac{1}{2}-x\right)\left(\dfrac{1}{2}+x\right)\)
c. x4 - 16
<=> (x2)2 - 42
<=> (x2 - 4)(x2 + 4)
d. x2 - 9
<=> x2 - 32
<=> (x - 3)(x + 3)
Mình làm và sửa đề đúng luôn nhé !
1) \(36x^2-a^2+10a-25\)
\(=\left(6x\right)^2-\left(a^2-10a+25\right)\)
\(=\left(6x\right)^2-\left(a-5\right)^2\)
\(=\left(6x-a+5\right)\left(6x+a-5\right)\)
2) \(4x^2-4xy+y^2-25a^2+10a-1\)
\(=\left(2x-y\right)^2-\left(5a-1\right)^2\)
\(=\left(2x-y-5a+1\right)\left(2x-y+5a-1\right)\)
3) \(m^2-6m+9-x^2+4xy-4y^2\)
\(=\left(m-3\right)^2-\left(x-2y\right)^2\)
\(=\left(m-3-x+2y\right)\left(m+3-x+2y\right)\)
a: Ta có: \(\sqrt{9x-54}-\sqrt{4x-24}=2\)
\(\Leftrightarrow3\sqrt{x-6}-2\sqrt{x-6}=2\)
\(\Leftrightarrow x-6=4\)
hay x=10
b: Ta có: \(\sqrt{4x^2+4x+1}=7\)
\(\Leftrightarrow\left|2x+1\right|=7\)
\(\Leftrightarrow\left[{}\begin{matrix}2x+1=7\\2x+1=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=6\\2x=-8\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-4\end{matrix}\right.\)
25a2b2 - 4x2 + 4x - 1
= (5ab)2 - (4x2 + 4x - 1)2
= (5ab)2 - (1 - 2x)2
= (5ab - 1 + 2x).(5ab + 1 - 2x)
25a2b2 - 4x2 + 4x - 1
= 25a2b2 - ( 4x2 - 4x + 1 )
= ( 5ab )2 - ( 2x - 1 )2
= ( 5ab - 2x + 1 )( 5ab + 2x - 1 )