!!

Cảm ơn bn nha

b) \(-4x^2-4x-1\)

\(=-\left(4x^2+4x+1\right)\)

\(=-\left(2x+1\right)^2\)

c) \(\frac{4}{9}x^2-25y^2\)

\(=\left(\frac{2}{3}x+5y\right)\left(\frac{2}{3}x-5y\right)\)

d) \(\frac{1}{27}x^3-8\)

\(=\left(\frac{1}{3}x-2\right)\left(\frac{1}{9}x+\frac{2}{3}x+4\right)\)

\(a,27-x^3\)

\(=3^3-x^3\)

\(=\left(3-x\right)\left(9+3x+x^2\right)\)

Các câu còn lại lm tương tự nhé.

hok tốt!

a)  \(27-x^3=\left(3-x\right)\left(9+3x+x^2\right)\)

b)  \(8x^3+0,001=\left(2x+0,1\right)\left(4x^2-0,2x+0,01\right)\)

c)  \(\frac{x^3}{125}-\frac{y^3}{27}=\left(\frac{x}{5}-\frac{y}{3}\right)\left(\frac{x^2}{25}+\frac{xy}{15}+\frac{y^2}{9}\right)\)

p/s: chúc bạn học tốt

a: \(x^4+4=x^4+4x^2+4-4x^2=\left(x^2+2-2x\right)\left(x^2+2+2x\right)\)

c: \(x^3-125=\left(x-5\right)\left(x^2+5x+25\right)\)

\(\dfrac{1}{8}x^3-64=\left(\dfrac{1}{2}x-4\right)\left(\dfrac{1}{4}x^2+2x+16\right)\)

d: \(=\left(2x+5y\right)^3\)

a, \(x^3+8=x^3+2x^2-2x^2-4x+4x+8\)

\(=x^2.\left(x+2\right)-2x.\left(x+2\right)+4.\left(x+2\right)\)

\(=\left(x+2\right).\left(x^2-2x+4\right)\)

c) \(-\dfrac{x^6}{125}-\dfrac{y^3}{64}\)

\(=-\left(\dfrac{x^6}{125}+\dfrac{y^3}{64}\right)\)

\(=-\left(\dfrac{x^2}{5}+\dfrac{y^4}{4}\right)\left(\dfrac{x^4}{25}-\dfrac{x^2y}{20}+\dfrac{y^2}{16}\right)\)

a)   \(m^2-n^2=\left(m-n\right)\left(m+n\right)\)

b)  \(\left(x^2+x-1\right)^2-\left(x^2+2x+3\right)^2=\left(x^2+x+1+x^2+2x+3\right)\left(x^2+x+1-x^2-2x-3\right)\)

\(=-\left(2x^2+3x+4\right)\left(x+2\right)\)

d)  \(64+16y+y^2=\left(8+y\right)^2\)

c) mk chỉnh đề:

\(16-\left(x-3\right)^2=\left(4+x-3\right)\left(4-x+3\right)=\left(x+1\right)\left(7-x\right)\)

ồ cuk dễ nhỉ

Nếu các bn thích thì ...........

cứ cho NTN này nhé !

a) \(m^2-n^2=\left(m-n\right)\left(m+n\right)\)

b) \(\left(x^2+x-1\right)^2-\left(x^2+2x+3\right)^2\)

\(=\left(x^2+x-1+x^2+2x+3\right)\left(x^2+x-1-x^2-2x-3\right)\)

\(=\left(2x^2+3x+2\right)\left(-4-x\right)\)

c) \(-16+\left(x-3\right)^2=\left(x-3\right)^2-16=\left(x-3-4\right)+\left(x-3+4\right)=\left(x-7\right)\left(x+1\right)\)

d) \(64+16y+y^2\)

\(=8^2+2.8.y+y^2\)

\(=\left(8+y\right)^2\)

\(27-x^3\)

\(=3^3-x^3\)

\(=\left(3-x\right)\left(9+3x+x^2\right)\)

\(8x^3+0,001\)

\(=\left(2x\right)^3+\left(\dfrac{1}{10}\right)^3\)

\(=\left(2x+\dfrac{1}{10}\right)\left(4x^2-2x\dfrac{1}{10}+\left(\dfrac{1}{10}\right)^2\right)\)

\(=2\left(x+\dfrac{1}{5}\right)\left(4x^2-\dfrac{1}{5}x+\dfrac{1}{100}\right)\)

\(\dfrac{x^3}{125}-\dfrac{y^3}{27}\)

\(=\left(\dfrac{x}{5}\right)^3-\left(\dfrac{y}{3}\right)^3\)

\(=\left(\dfrac{x}{5}-\dfrac{y}{3}\right)\left[\left(\dfrac{x}{5}\right)^2+\dfrac{x}{5}.\dfrac{y}{3}+\left(\dfrac{y}{3}\right)^2\right]\)

\(=\left(\dfrac{x}{5}-\dfrac{y}{3}\right)\left(\dfrac{x^2}{25}+\dfrac{xy}{15}+\dfrac{y^2}{9}\right)\)

b )

Dấu = thứ 3 :

Sửa lại : \(2\left(x+\dfrac{1}{20}\right)\)

1.\(x^{16}-y^{16}=\left(x^8-y^8\right)\left(x^8+y^8\right)\)

2.\(x^3-125=x^3-5^3=\left(x-5\right)\left(x^2+5x+25\right)\)

\(-64+\frac{1}{8}x^3=\left(\frac{x}{2}\right)^3-4^3=\left(\frac{x}{2}-4\right)\left(\frac{x^2}{4}+2x+16\right)\)

\(8x^3+60x^2y+150xy^2+125y^3=\left(2x\right)^3+3.\left(2x\right)^2.\left(5y\right)+3.\left(2x\right).\left(5y\right)^2+\left(5y\right)^3\)

\(=\left(2x+5y\right)^3\)

cám ơn bn Nguyễn Minh Quang nhé

a: \(=\left(m-n\right)\left(m+n\right)\)

b: \(=\left(x^2+x-1-x^2-2x-3\right)\left(x^2+x-1+x^2+2x+3\right)\)

\(=\left(-x-4\right)\left(2x^2+3x+2\right)\)

d: \(=\left(y+8\right)^2\)