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Phương Dung
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Phạm Anh Tuấn
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Đoàn Trần Quỳnh Hương
31 tháng 12 2022 lúc 21:54

a.  \(x^2-5x\ne0\)

=> ĐKXĐ: \(x\left(x-5\right)\ne0\) => \(\left\{{}\begin{matrix}x\ne0\\x\ne5\end{matrix}\right.\)

b. \(\dfrac{x^2-10x+25}{x^2-5x}\)

\(\dfrac{\left(x-5\right)^2}{x\left(x-5\right)}\)

\(\dfrac{x-5}{x}\)

 

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x2−10x+25x2−5x=(x−5)2x(x−5)=x−5x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">x2−10x+25x2−5x=(x−5)2x(x−5)=x−5x

x−5x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">x−5x phải có giá trị nguyên.

x+12x−2+3x2−1−x+32x+2)⋅(4x2−45)" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">x+12x−2+3x2−1−x+32x+2)⋅(4x2−45)

x+12(x−1)+3(x−1)(x+1)−x+32(x+1))⋅2(2x2−2)5" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">x+12(x−1)+3(x−1)(x+1)−x+32(x+1))⋅2(2x2−2)5

(x+1)2+6−(x−1)(x+3)2(x−1)(x+1)⋅2⋅2(x2−1)5" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">(x+1)2+6−(x−1)(x+3)2(x−1)(x+1)⋅2⋅2(x2−1)5

(x+1)2+6−(x2+3x−x−3)(x−1)(x+1)⋅2(x−1)(x+1)5" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">(x+1)2+6−(x2+3x−x−3)(x−1)(x+1)⋅2(x−1)(x+1)5

25" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">25

25" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">25

25" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">25

2(x+1)25+185−25x2−45x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-table; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">2(x+1)25+185−25x2−45x

2(x2+2x+1)5+185−25x2−45x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">2(x2+2x+1)5+185−25x2−45x

2x2+4x+25+185−25x2−45x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">2x2+4x+25+185−25x2−45x

2x2+4x+2+185−25x2−45x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">2x2+4x+2+185−25x2−45x

2x2+4x+205−25x2−45x" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline; float:none; line-height:normal; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; overflow-wrap:normal; padding:0px; position:relative; white-space:nowrap; word-spacing:normal" class="MathJax">2x2+4x+205−25x2−45x

c) tự làm, đkxđ: x1;x1

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nguyễn hải đăng
19 tháng 12 2019 lúc 21:50

ê k bn với mk ik

😘 😘 😘 😘

Nguyễn Quỳnh Như
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Nguyễn Lê Minh Quân
28 tháng 11 2021 lúc 21:21

EM MỚI LỚP 3 LÊN EM  KO BIẾT GÌ HẾT

CHẮC CHỊ HOẶC ANH NÊN TRA GOOGLE

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Darlingg🥝
28 tháng 11 2021 lúc 22:52

Tham khảo lấy nguồn từ Vietjack.com 

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Dương Đức Nghĩa
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No ri do
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Nguyễn Lê Phước Thịnh
4 tháng 2 2022 lúc 13:49

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

\(\dfrac{5x^3+10x^2+5x}{x^3+3x^2+3x+1}=\dfrac{5x\left(x+1\right)^2}{\left(x+1\right)^3}=\dfrac{5x}{x+1}\)

luu anh phuong
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Pham Trong Bach
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Cao Minh Tâm
28 tháng 1 2017 lúc 18:20

Trần Khánh Châm
27 tháng 11 2022 lúc 8:06

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Đỗ Ngọc Phúc
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