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\(=\left(\dfrac{3}{4}-\dfrac{1}{2}x\right)\left(\dfrac{3}{4}+\dfrac{1}{2}x\right)\)
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a)8x3 + * + * + 27y3 = (* + *)3
=>A=(2x+3y)^3
b) (2x+1)^3
c)(x-2y)^3
d)(3x-2)(3x+2)
e)(3x-1)(9x^2+3x+1)
f)....................
6: \(27x^3+1=\left(3x+1\right)\left(9x^2-3x+1\right)\)
7: \(\left(2x+1\right)^2=4x^2+4x+1\)
8: \(\left(2x-1\right)^2=4x^2-4x+1\)
9: \(9-16x^2=\left(3-4x\right)\left(3+4x\right)\)
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(xy² - 1/2)(2 + 4xy²)
= 4(xy² - 1/2)(xy² + 1/2)
= 4[(xy²)² - (1/2)²]
= 4(x²y⁴ - 1/4)
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câu 2 :
\(100+10x+\frac{1}{4x^2}\)
<=> \(\left(10\right)^2+2.10.\frac{1}{2x}+\left(\frac{1}{2x}\right)^2\)
<=> \(\left(10+\frac{1}{2}x\right)^2\)
câu 1 :
\(\frac{25}{x^2}-\frac{5}{2}+\frac{x^2}{16}\)
\(\Leftrightarrow\)\(\left(\frac{5}{x}\right)^2-2.\frac{5}{x}.\frac{x}{4}+\left(\frac{x}{4}\right)^2\)
\(\Leftrightarrow\)\(\left(\frac{5}{x}+\frac{x}{4}\right)^2\) k mình nhé bạn !!
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a) \(=\left(x-2\right)^2\)
b) \(=\left(3x-2\right)^2\)
c) \(=\left(x-3y\right)^2\)
d) \(=\left(\dfrac{x}{2}+1\right)^2\)
e) \(=\left(x-4\right)^2\)
f) \(=\left(\dfrac{1}{2}xy^2+1\right)^2\)
g) \(=\left(x-1\right)\left(x+1\right)\)
h) \(=\left(5x-4\right)\left(5x+4\right)\)
Đề sai r bn nhé
\(4xy+4x^2y^2+1\)
\(=4x^2y^2+4xy+1\)
\(=\left(2xy\right)^2+2.2xy.1+1^2\)
\(=\left(2xy+1\right)^2\)