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\(=y\left(x-5\right)+2\left(x-5\right)\)
\(=\left(y+2\right)\left(x-5\right)\)
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2x^2-xy+5y-25
= -(xy-5y-2x^2+25)
nah bạn chúc bạn học tốt nha
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a: \(=\dfrac{3x-x+6}{x\left(2x+6\right)}=\dfrac{1}{x}\)
b: \(=\dfrac{1}{x\left(y-x\right)}-\dfrac{1}{y\left(y-x\right)}\)
\(=\dfrac{y-x}{xy\left(y-x\right)}=\dfrac{1}{xy}\)
c: \(=\dfrac{\left(1-2x\right)\left(1+2x\right)}{x\left(x+4\right)}\cdot\dfrac{3x}{2\left(1-2x\right)}\)
\(=\dfrac{3\left(1+2x\right)}{2\left(x+4\right)}\)
d: \(=\dfrac{12x}{8x^3}\cdot\dfrac{15y^4}{5y^3}=\dfrac{3}{2x^2}\cdot3y=\dfrac{9y}{2x^2}\)
f: \(=\dfrac{\left(x-2\right)\left(x+2\right)}{3\left(x+4\right)}\cdot\dfrac{x+4}{2\left(x-2\right)}=\dfrac{x+2}{6}\)
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Sửa đề: xy-5y+2x-10
=y(x-5)+2(x-5)
=(x-5)(y+2)
=y(x-5)+2(x-50)
=y(x-5)+2(x-5)-90
=(x-5)(y+2)-90