Viết các đa thức sau thành bình phương của một tổng hoặc một hiệu
a) x^2-6x+9
b) 1/4a^2+2ab^2+4b^4
c) 25+10x+x^2
d) 1/9-2/3y^4+y^8
(CẦN GẤP)
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a. x2 + 6x + 9 = (x + 3)2
b. 25 + 10x + x2 = (5 + x)2
c. x2 + 8x + 16 = (x + 4)2
d. x2 + 14x + 49 = (x + 7)2
e. 4x2 + 12x + 9 = (2x + 3)2
f. 9x2 + 12x + 4 = (3x + 2)2
h. 16x2 + 8 + 1 = (4x + 1)2
i. 4x2 + 12xy + 9y2 = (2x + 3y)2
k. 25x2 + 20xy + 4y2 = (5x + 2y)2
a) \(=\left(x+3\right)^2\)
b) \(=\left(x+5\right)^2\)
c) \(=\left(x+4\right)^2\)
d) \(=\left(x+7\right)^2\)
e) \(=\left(2x+3\right)^2\)
f) \(=\left(3x+2\right)^2\)
h) \(=\left(4x+1\right)^2\)
i) \(=\left(2x+3y\right)^2\)
k) \(=\left(5x+2y\right)^2\)
a:Sửa đề: \(\dfrac{1}{4}a^2+2ab+4b^2\)
\(=\left(\dfrac{1}{2}a\right)^2+2\cdot\dfrac{1}{2}a\cdot2b+\left(2b\right)^2\)
\(=\left(\dfrac{1}{2}a+2b\right)^2\)
b: Sửa đề:\(y^4-\dfrac{1}{3}y^4+\dfrac{1}{36}\)
\(=y^8-2\cdot y^4\cdot\dfrac{1}{6}+\dfrac{1}{36}\)
\(=\left(y^4-\dfrac{1}{6}\right)^2\)
\(a,=\left(x^2y+3\right)^2\\ b,=\left(2x+y\right)^2\\ c,=\left(5y^2-1\right)^2\)
\(x^2-6x+9=\left(x-3\right)^2\)
\(25+10x+x^2=\left(5+x\right)^2\)
\(\frac{1}{4}a^2+2ab^2+4b^4=\left(\frac{1}{2}a+2b^2\right)^2\)
\(\frac{1}{9}-\frac{2}{3}y^4+y^8=\left(\frac{1}{3}-y^4\right)^2\)
\(\left(3x+2\right)^2-4=\left(3x+2-2\right)\left(3x+2+2\right)=3x\left(3x+4\right)\)
\(4x^2-25y^2=\left(2x-5y\right)\left(2x+5y\right)\)
\(4x^2-49=\left(2x-7\right)\left(2x+7\right)\)
\(8z^3+27=\left(2z+3\right)\left(4z^2-6z+9\right)\)
\(\frac{9}{25}x^4-\frac{1}{4}=\left(\frac{3}{5}x^2-\frac{1}{2}\right)\left(\frac{3}{5}x^2+\frac{1}{2}\right)\)
\(25x^2-10xy+y^2=\left(5x\right)^2-2.5x.y+y^2=\left(5x-y\right)^2\)
\(\dfrac{4}{9}x^2+\dfrac{20}{3}xy+25y^2=\left(\dfrac{2}{3}x\right)^2+2.\dfrac{2}{3}x.5y+\left(5y\right)^2=\left(\dfrac{2}{3}x+5y\right)^2\)
\(x^2-6x+9=x^2-2.3x+3^2=\left(x-3\right)^2\)
\(\frac{1}{4}a^2+2ab^2+4b^4=\left(\frac{1}{2}a\right)^2+2.\frac{1}{2}a.2b^2+\left(2b\right)^2=\left(\frac{1}{2}a+2b\right)^2\)
\(25+10x+x^2=5^2+2.5x+x^2=\left(5+x\right)^2\)
\(\frac{1}{9}-\frac{2}{3}y^4+y^8=\left(\frac{1}{3}\right)^2-2.\frac{1}{3}y^4+\left(y^4\right)^2=\left(\frac{1}{3}-y^4\right)^2\)
a,(x-3)^2
b,(1/4x+2b^2)^2
c,(5+x)^2
d,(1/3-y^4)^2