ai giup tui vs , ai nhanh tui tickkkkk cko\(\frac{1}{2}x\frac{1}{3}-\frac{1}{8}=??\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)
\(=1-\frac{1}{100}\)
\(=\frac{99}{100}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2}{x-3}+\frac{x-5}{x-1}=1\)
\(ĐKXĐ:x\ne1;x\ne3\)
\(pt\Leftrightarrow\frac{2x-2}{x^2-4x+3}+\frac{x^2-8x+15}{x^2-4x+3}=1\)
\(\Leftrightarrow\frac{x^2-6x+13}{x^2-4x+3}=1\)
\(\Leftrightarrow x^2-6x+13=x^2-4x+3\)
\(\Leftrightarrow-2x+10=0\Leftrightarrow x=-5\left(t/mđkxđ\right)\)
Vậy pt có 1 nghiệm là -5
2/x - 3 + x - 5/x - 1 = 1
2(x - 1) + (x - 5)(x - 3) = (x - 3)(x - 1)
-6x + 13 + x^2 = x^2 - 4x + 3
-6x + 13 = -4x + 3
13 = -4x + 3 + 6x
13 = 2x + 3
13 - 3 = 3x
10 = 2x
5 = x
=> x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{98}{30}=\frac{49}{15}\)
\(1\frac{3}{10}:5\frac{7}{8}=\frac{13}{10}:\frac{47}{8}=\frac{104}{470}=\frac{52}{235}\)
Bn như thần ý nhỉ :)
trả lời:
8x1/6:2x1/2
=4/3:1
=4/3
1x3/10:5x7/8
=3/10:35/8
=12/175
chúc học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{x}{3}=\frac{2}{3}-\frac{1}{7}\)
\(\Leftrightarrow\frac{x}{3}=\frac{11}{21}\)
\(\Leftrightarrow21x=33\)
\(\Leftrightarrow x=\frac{33}{21}=\frac{11}{7}\)
\(\frac{1}{2}\times\frac{1}{3}-\frac{1}{8}=\frac{1}{6}-\frac{1}{8}=\frac{4}{24}-\frac{3}{24}=\frac{1}{24}.\)
7/24