\(\dfrac{-2x}{15x^3y^2};\dfrac{-6y}{10x^4z^3};\dfrac{x+1}{20y^{3z}}\)
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\(\dfrac{2x^3-2y^3}{3x+3y}.\dfrac{15x^2-15y^2}{x^2+xy+y^2}\)
\(=\dfrac{30\left(x^3-y^3\right)\left(x^2-y^2\right)}{3\left(x+y\right)\left(x^2+xy+y^2\right)}=\dfrac{10\left(x-y\right)^2\left(x+y\right)\left(x^2+xy+y^2\right)}{\left(x+y\right)\left(x^2+xy+y^2\right)}=10\left(x-y\right)^2\)
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Làm phép cộng
a, \(\dfrac{3x^2y+5}{15x^3y^4}+\dfrac{3x^2y-5}{15x^3y^4}\)
b,\(\dfrac{2x^2-x}{x^2+x+1}+\dfrac{x^3-2x^2+x+1}{x^2+x+1}\)
Các bạn giúp mk nha
a/ \(\dfrac{3x^2y+5}{15x^3y^4}+\dfrac{3x^2y-5}{15x^3y^4}=\dfrac{3x^2y+5+3x^2y-5}{15x^3y^4}=\dfrac{6x^2y}{15x^3y^4}=\dfrac{2}{5xy^3}\)
b/ \(\dfrac{2x^2-x}{x^2+x+1}+\dfrac{x^3-2x^2+x+1}{x^2+x+1}=\dfrac{2x^2-x+x^3-2x^2+x+1}{x^2+x+1}=\dfrac{x^3+1}{x^2+x+1}\)
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Thực hiện phép tính :
a/ (x - 1)^2 - (4x + 3) (2 - x)
b/ (15x^3y^2 - 6x^2y^3) : 3x^2y^2 = (15x^3y^2 : 3x^2y^2) - (6x^2y^3 : 3x^2y^2) = 5x - 2y
c/\(\dfrac{x+7}{x-7}\) - \(\dfrac{x-7}{x+7}\) +\(\dfrac{4x^2}{x^2-49}\)
a/ (x-1)2-(4x+3)(2-x)=x2-2x+1-(8x-4x2+6-3x)
=x2-2x+1-8x+4x2-6+3x=5x2-7x-6
b/ (15x3y2 - 6x2y3) : 3x2y2 = 5x - 2y
c/ \(\dfrac{x+7}{x-7}-\dfrac{x-7}{x+7}+\dfrac{4x^2}{x^2-49}\)=\(\dfrac{\left(x+7\right)^2-\left(x-7\right)^2+4x^2}{\left(x-7\right)\left(x+7\right)}\)=\(\dfrac{x^2+14x+49-\left(x^2-14x+49\right)+4x^2}{\left(x-7\right)\left(x+7\right)}\)=\(\dfrac{28x+4x^2}{\left(x-7\right)\left(x+7\right)}\)=\(\dfrac{4x\left(x+7\right)}{\left(x-7\right)\left(x+7\right)}\)=\(\dfrac{4x}{x-7}\)
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Cộng các phân thức khác mẫu thức :
a) \(\dfrac{5}{6x^2y}+\dfrac{7}{12xy^2}+\dfrac{11}{18xy}\)
b) \(\dfrac{4x+2}{15x^3y}+\dfrac{5y-3}{9x^2y}+\dfrac{x+1}{5xy^3}\)
c) \(\dfrac{3}{2x}+\dfrac{3x-3}{2x-1}+\dfrac{2x^2+1}{4x^2-2x}\)
d) \(\dfrac{x^3+2x}{x^3+1}+\dfrac{2x}{x^2-x+1}+\dfrac{1}{x+1}\)
c) 10x^2(x-y)+15x^3(y-x)
d)5x(2x-3y)-15(3y-2x)
\(c,=\left(x-y\right)\left(10x^2-15x^3\right)=5x^2\left(2-3x\right)\left(x-y\right)\\ d,=\left(2x-3y\right)\left(5x+15\right)=5\left(x+3\right)\left(2x-3y\right)\)
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c: \(10x^2\left(x-y\right)+15x^3\left(y-x\right)\)
\(=10x^2\left(x-y\right)-15x^3\left(x-y\right)\)
\(=5x^2\left(x-y\right)\left(2-3x\right)\)
d: \(5x\left(2x-3y\right)-15\left(3y-2x\right)\)
\(=5x\left(2x-3y\right)+15\left(2x-3y\right)\)
\(=5\left(2x-3y\right)\left(x+3\right)\)
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c) 10x^2(x-y)+15x^3(y-x)
d)5x(2x-3y)-15(3y-2x)
c: \(10x^2\left(x-y\right)+15x^3\left(y-x\right)\)
\(=10x^2\left(x-y\right)-15x^3\left(x-y\right)\)
\(=5x^2\left(2-3x\right)\left(x-y\right)\)
d: \(5x\left(2x-3y\right)-15\left(3y-2x\right)\)
\(=5x\left(2x-3y\right)+15\left(2x-3y\right)\)
\(=5\left(x+3\right)\left(2x-3y\right)\)
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Giải hệ phương trình\(\left\{{}\begin{matrix}\text{3(3y+2)+4(5x-4)=0}\\\dfrac{5x-4}{15x-2}=\dfrac{3y+2}{9y+4}\end{matrix}\right.\)
Xem chi tiết
ĐKXĐ: \(\left\{{}\begin{matrix}x\ne\dfrac{2}{15}\\y\ne-\dfrac{4}{9}\end{matrix}\right.\)
\(\left\{{}\begin{matrix}9y+6+20x-16=0\\\left(5x-4\right)\left(9y+4\right)=\left(3y+2\right)\left(15x-2\right)\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}20x+9y=10\\5x+15y=-6\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{4}{5}\\y=-\dfrac{2}{3}\end{matrix}\right.\)
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thực hiện phép tính:
a,\(\left(9x^2y^3-15x^4y^4\right):3x^2y-\left(2-3x^2y\right)y^2\)
b,\(\left(6x^2-xy\right):x+\left(2x^3y+3xy^2\right):xy-\left(2x-1\right)x\)
c,\(\left(x^2-xy\right):x-+\left(6x^2y^5-9x^3y^4+15x^4y^2\right):\dfrac{3}{2}x^2y^3\)
thực hiện phép tính:
a,\(\left(9x^2y^3-15x^4y^4\right):3x^2y-\left(2-3x^2y\right)y^2\)
b,\(\left(6x^2-xy\right):x+\left(2x^3y+3xy^2\right):xy-\left(2x-1\right)x\)
c,\(\left(x^2-xy\right):x-+\left(6x^2y^5-9x^3y^4+15x^4y^2\right):\dfrac{3}{2}x^2y^3\)
a: \(=3y^2-5x^2y^3-2y^2+3x^2y^3=y^2-2x^2y^3\)
b: \(=6x-y+2x^2+3y^2-2x^2+x=7x-y+3y^2\)
c: \(=x-y+4y^2-6xy+\dfrac{10x^2}{y}\)
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