\(\frac{6}{x-1}-\frac{4}{x-3}=\frac{8}{\left(x-1\right)\left(3-x\right)}\)
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1.
\(\frac{2x+3}{4}-\frac{5x+3}{6}=\frac{3-4x}{12}\)
\(MC:12\)
Quy đồng :
\(\Rightarrow\frac{3.\left(2x+3\right)}{12}-\left(\frac{2.\left(5x+3\right)}{12}\right)=\frac{3x-4}{12}\)
\(\frac{6x+9}{12}-\left(\frac{10x+6}{12}\right)=\frac{3x-4}{12}\)
\(\Leftrightarrow6x+9-\left(10x+6\right)=3x-4\)
\(\Leftrightarrow6x+9-3x=-4-9+16\)
\(\Leftrightarrow-7x=3\)
\(\Leftrightarrow x=\frac{-3}{7}\)
2.\(\frac{3.\left(2x+1\right)}{4}-1=\frac{15x-1}{10}\)
\(MC:20\)
Quy đồng :
\(\frac{15.\left(2x+1\right)}{20}-\frac{20}{20}=\frac{2.\left(15x-1\right)}{20}\)
\(\Leftrightarrow15\left(2x+1\right)-20=2\left(15x-1\right)\)
\(\Leftrightarrow30x+15-20=15x-2\)
\(\Leftrightarrow15x=3\)
\(\Leftrightarrow x=\frac{3}{15}=\frac{1}{5}\)
A= \(\frac{1}{x+1}-\frac{1}{x+2}+\frac{1}{x+2}-\frac{1}{x+3}+\frac{2}{x+3}-...+\frac{8}{x+5}-\frac{8}{x+6}\)
A=\(\frac{1}{x+1}+\frac{1}{x+3}+\frac{2}{x+4}+\frac{4}{x+5}-\frac{8}{x+6}\)
Rồi tiếp tục làm nhé bạn.
tớ ko bt lm abc , tớ lm d thôi nha , thứ lỗi
\(\frac{5}{2x-3}-\frac{1}{x+2}=\frac{5}{x-6}-\frac{7}{2x-1}\)
\(\frac{3x+13}{2x^2+x-6}=\frac{5}{x-6}+\frac{7}{1-2x}\)
\(\frac{3x+13}{\left(x+2\right)\left(2x-3\right)}=\frac{3x+37}{\left(x-6\right)\left(2x-1\right)}\)
\(\frac{10-9x}{-4x^3+32x^2-51x+18}=0\)
\(\Rightarrow\orbr{\begin{cases}x=-3\\x=\frac{10}{9}\end{cases}}\)
\(a,\left(\frac{6^3-10.5^3}{6^2.3^3-15^2.5^2}.|x-2|\right):10=\left(1-\frac{1}{2}\right)....\left(1-\frac{1}{10}\right)\)
\(=\frac{1.2.3.4...9}{1.2.....10}=\frac{1}{10}\Leftrightarrow\frac{6^3-10.5^3}{6^2.3^3-15^2.5^2}.|x-2|=1\)
\(\Leftrightarrow\frac{6^2.6-2.5^4}{6^2.3^2-3^2.5^4}.|x-2|=1\Leftrightarrow|x-2|.\frac{2}{3}=1\Leftrightarrow|x-2|=\frac{3}{2}\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{2}\\x=\frac{7}{2}\end{cases}}\)
\(\left(\frac{6^3-10,5^3}{6^2.3^3-15^2.5^2}.\left|x-2\right|\right):10=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).....\left(1-\frac{1}{9}\right).\left(1-\frac{1}{10}\right)\)
\(=\frac{1.2.3.4...9}{1.2.....10}=\frac{1}{10}\)
\(\Leftrightarrow\frac{6^3-10,5^3}{6^2.3^3-15^2.5^2}.\left|x-2\right|=1\)
\(\Leftrightarrow\frac{6^2.6-2.5^4}{6^2.3^2-3^2.5^4}.\left|x-2\right|=1\)
\(\Leftrightarrow\left|x-2\right|.\frac{2}{3}=1\Leftrightarrow\left|x-2\right|=\frac{3}{2}\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{2}\\x=\frac{7}{2}\end{cases}}\)
Ta có :
\(\frac{6}{x-1}-\frac{4}{x-3}=\frac{8}{\left(x-1\right)\left(3-x\right)}\)
\(\Leftrightarrow\)\(\frac{6\left(x-3\right)-4\left(x-1\right)}{\left(x-1\right)\left(x-3\right)}=\frac{8}{\left(x-1\right)\left(x-3\right)}\) ( quy đồng vế trái )
\(\Leftrightarrow\)\(6\left(x-3\right)-4\left(x-1\right)=8\) ( khử mẫu )
\(\Leftrightarrow\)\(6x-18-4x+4=8\) ( áp dụng tính chất phân phối của phép nhân đối với phép cộng )
\(\Leftrightarrow\)\(6x-4x=8+18-4\) ( chuyển vế )
\(\Leftrightarrow\)\(2x=22\)
\(\Leftrightarrow\)\(x=\frac{22}{2}\)
\(\Leftrightarrow\)\(x=11\)
Vậy \(x=11\)
Chúc bạn học tốt ~
Theo bài ra ta có :
\(\frac{6}{x-1}\)\(-\)\(\frac{4}{x-3}\)= \(\frac{8}{\left(x-1\right)\left(x-3\right)}\)
\(\frac{6\left(x-3\right)-4\left(x-1\right)}{\left(x-1\right)\left(x-3\right)}\)= \(\frac{8}{\left(x-1\right)\left(x-3\right)}\)
\(6\left(x-3\right)\)\(-4\left(x-1\right)\)= 8
\(6x-18-4x\)+ 4 = 8
\(6x-4x\)= 18 + 8 - 4
\(6x-4x\)= 22
\(2x=22\)
\(=>\)x = 22 : 2
x = 11
Vậy \(x=11\)