Tính \(\frac{1}{9}:\frac{3}{5}.3^x=3^{2x+1}\)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{x-3}{5}-\frac{2x-1}{10}=\frac{x+1}{2}+\frac{1}{4}\)
\(< =>\frac{\left(x-3\right).4}{20}-\frac{\left(2x-1\right).2}{20}=\frac{\left(x+1\right).10}{20}+\frac{5}{20}\)
\(< =>4x-12-4x+2=10x+10+5\)
\(< =>10x=-10-10-5=-25\)
\(< =>x=-\frac{25}{10}=-\frac{5}{2}\)
\(\frac{x+3}{2}-\frac{2x-1}{3}-1=\frac{x+5}{5}\)
\(< =>\frac{\left(x+3\right).15}{30}-\frac{\left(2x-1\right).10}{30}-\frac{30}{30}=\frac{\left(x+5\right).5}{30}\)\(< =>15x+45-20x+10-30=5x+25\)
\(< =>-5x+25=5x+25< =>10x=0< =>x=0\)
d: =>4x+6=15x-12
=>4x-15x=-12-6=-18
=>-11x=-18
hay x=18/11
e: =>\(45x+27=12+24x\)
=>21x=-15
hay x=-5/7
f: =>35x-5=96-6x
=>41x=101
hay x=101/41
g: =>3(x-3)=90-5(1-2x)
=>3x-9=90-5+10x
=>3x-9=10x+85
=>-7x=94
hay x=-94/7
a/ ĐK: \(x\ne\pm3\)
\(\frac{2x-3}{x^2-9}+\frac{2x\left(x+3\right)}{x^2-9}+\frac{5\left(x-3\right)}{x^2-9}=0\)
\(\Leftrightarrow2x-3+2x^2+6x+5x-15=0\)
\(\Leftrightarrow2x^2+13x-18=0\)
\(\Rightarrow\left[{}\begin{matrix}x=\frac{-13+\sqrt{313}}{4}\\x=\frac{-13-\sqrt{313}}{4}\end{matrix}\right.\)
b/ ĐKXĐ: \(x\ne1;-3\)
\(\frac{\left(3x-1\right)\left(x+3\right)}{x^2+2x-3}-\frac{\left(2x+5\right)\left(x-1\right)}{x^2+2x-3}+\frac{4}{x^2+2x-3}-\frac{x^2+2x-3}{x^2+2x-3}=0\)
\(\Leftrightarrow3x^2+8x-3-\left(2x^2+3x-5\right)+4-\left(x^2+2x-3\right)=0\)
\(\Leftrightarrow3x+9=0\)
\(\Rightarrow x=-3\) (ko thỏa mãn)
Vậy pt vô nghiệm
1/ \(\frac{3\left(x+3\right)}{4}+\frac{1}{2}=\frac{5x+9}{3}-\frac{7x-9}{4}\)
=> \(\frac{9\left(x+3\right)}{12}+\frac{6}{12}=\frac{4\left(5x+9\right)}{12}-\frac{3\left(7x-9\right)}{12}\)
=> \(9\left(x+3\right)+6=4\left(5x+9\right)-3\left(7x-9\right)\)
=> \(9x+27+6=20x+36-21x+27\)
=> \(9x-20x+21x=27-27-6+36\)
=> \(10x=30\)
=> \(x=3\)
Vậy phương trình có tập nghiệm là \(S=\left\{3\right\}\)
2.Ta có : \(\frac{2x-3}{3}-\frac{x-3}{6}=\frac{4x+3}{5}-17\)
=> \(\frac{10\left(2x-3\right)}{30}-\frac{5\left(x-3\right)}{30}=\frac{6\left(4x+3\right)}{30}-\frac{510}{30}\)
=> \(10\left(2x-3\right)-5\left(x-3\right)=6\left(4x+3\right)-510\)
=> \(20x-30-5x+15=24x+18-510\)
=> \(20x-5x-24x=18-510+30-15\)
=> \(-9x=-477\)
=> \(x=53\)
Vậy phương trình có tập nghiệm là \(S=\left\{53\right\}\)
3/ Ta có : \(\frac{5x-1}{6}+\frac{2\left(x+4\right)}{9}=\frac{7x-5}{15}+x-1\)
=> \(\frac{30\left(5x-1\right)}{180}+\frac{40\left(x+4\right)}{180}=\frac{12\left(7x-5\right)}{180}+\frac{180x}{180}-\frac{180}{180}\)
=> \(30\left(5x-1\right)+40\left(x+4\right)=12\left(7x-5\right)+180x-180\)
=> \(150x-30+40x+160=84x-60+180x-180\)
=> \(150x+40x-180x-84x=-60-180-160+30\)
=> \(-74x=-370\)
=> \(x=5\)
Vậy phương trình có tập nghiệm là \(S=\left\{5\right\}\)
a) Đặt \(x-1=a\)
\(pt\Leftrightarrow\frac{13}{a}+\frac{5}{2a}=\frac{6}{3a}\)
\(\Leftrightarrow\frac{31}{2a}=\frac{6}{3a}\)
\(\Leftrightarrow\frac{31}{2}=2\)(vô lí)
Vậy pt vô nghiệm
a) \(\frac{13}{x-1}+\frac{5}{2x-2}=\frac{6}{3x-3}\)
\(\frac{13}{x-1}+\frac{5}{2\left(x-1\right)}=\frac{6}{3\left(x-1\right)}\)
\(\frac{13}{x-1}+\frac{5}{2\left(x-1\right)}=\frac{2}{x-1}\)
\(\frac{31}{2\left(x-1\right)}=\frac{2}{x-1}\)
\(\frac{31}{2}=2\)
=> không có x thỏa mãn đề bài.
b) \(\frac{1}{x-1}+\frac{-2}{3}\left(\frac{3}{4}-\frac{6}{5}\right)=\frac{5}{2-2x}\)
\(\frac{1}{x-1}+\frac{-2}{3}.\frac{-9}{20}=\frac{5}{2\left(1-x\right)}\)
\(\frac{1}{x-1}-\frac{-18}{60}=\frac{5}{2\left(1-x\right)}\)
\(\frac{1}{x-1}+\frac{3}{10}=\frac{5}{2\left(1-x\right)}\)
\(10\left(1-x\right)+3\left(x-1\right)\left(1-x\right)=25\left(x-1\right)\)
\(7-4x-3x^2=25x-25\)
\(7-4x-3x^2-25x+25=0\)
\(32-29x-3x^2=0\)
\(3x^2+29x-30=0\)
\(3x^2+32x-3x-32=0\)
\(x\left(3x+32\right)-\left(3x+32\right)=0\)
\(\left(3x+32\right)\left(x-1\right)=0\)
\(\orbr{\begin{cases}3x+32=0\\x-1=0\end{cases}}\)
\(\orbr{\begin{cases}x=-\frac{32}{3}\\x=1\end{cases}}\)