Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\left(\dfrac{x}{x+2y}-\dfrac{x+2y}{2y}\right)\left(\dfrac{x}{x-2y}-1+\dfrac{8y^3}{8y^3-x^3}\right)=\dfrac{2xy-\left(x+2y\right)^2}{2y\left(x+2y\right)}\left(\dfrac{2y}{x-2y}+\dfrac{8y^3}{\left(2y-x\right)\left(4y^2+2yx+x^2\right)}\right)=\dfrac{-\left(x^2+2xy+4y^2\right)}{2y\left(x+2y\right)}\cdot\dfrac{2y\left(4y^2+2yx+x^2\right)-8y^3}{\left(x-2y\right)\left(x^2+2xy+4y^2\right)}=\dfrac{-\left(x^2+2xy+4y^2\right)2y\left(4y^2+2xy+x^2-4y^2\right)}{2y\left(x+2y\right)\left(x-2y\right)\left(x^2+2x+4y^2\right)}=\dfrac{-\left(x^2+2xy\right)}{\left(x+2y\right)\left(x-2y\right)}=\dfrac{x}{2y-x}\)
2(2y + 1)(8y - 3) + (3 - 4y)(8y - 7) = 6y + 73
32y2 - 12y + 16y - 6 + 24y - 21 - 32y2 + 28y = 6y + 73
56y - 27 = 6y + 73
56y - 6y = 73 + 27
50y = 100
y = 100 : 50
y = 2
2(2y + 1)(8y - 3) + (3 - 4y)(8y - 7) = 6y + 73
32y2 - 12y + 16y - 6 + 24y - 21 - 32y2 + 28y = 6y + 73
56y - 27 = 6y + 73
56y - 6y = 73 + 27
50y = 100
y = 100 : 50
y = 2
tick và theo dõi giúp mình nha
\(\left(x^3+8y^3\right)\div\left(x+2y\right)\)
\(=\left[x^3+\left(2y\right)^3\right]\div\left(x+2y\right)\)
\(=\left(x+2y\right)\left(x^2-2xy+4y^2\right)\div\left(x+2y\right)\)
\(=x^2-2xy+4y^2\)
\(\frac{x^3+8y^3}{x+2y}\)
\(=\frac{x^3+\left(2y\right)^3}{x+2y}\)
\(=\frac{\left(x+2y\right)\left(x^2+4y^2-2xy\right)}{x+2y}\)
\(=x^2+4y^2-2xy\)
\(\left(x^3+8y^3\right):\left(x+2y\right)\)
\(=\left[x^3+\left(2y\right)^3\right]:\left(x+2y\right)\)
\(=\left(x+2y\right)\left(x^2-2xy+4y^2\right):\left(x+2y\right)\)
\(=x^2-2xy+4y^2\)
P= 125x^3-8y^3
=5^3x^3-2^3y^3
=(5x)^3-(2y)^3
=(5x-2y)(25x^2+10xy+4y^2)
P=4x(x-2y)+8y(2y-x)
=4x(x-2y)-8y(x-2y)
=(4x-8y)(x-2y)
=4(x-2y)(x-2y)
=4(x-2y)^2
(2x+1)^2-(x-1)^2=(2x+1-x+1)(2x+1+x-1)
=(x+2)3x
K NHA!