a)\(1\frac{5}{6}=\frac{-x}{5}\)
\(\Leftrightarrow\frac{11}{6}=\frac{-x}{5}\)\(\Rightarrow-6x=55\)
\(\Rightarrow x=-\frac{55}{6}\)
b)\(\frac{4\cdot25}{8}=\frac{-3\cdot5}{x}\)
\(\Leftrightarrow\frac{100}{8}=\frac{-15}{x}\)\(\Rightarrow100x=-15\cdot8\)
\(\Rightarrow100x=-120\)
\(\Rightarrow x=-\frac{6}{5}\)
1. Tìm x ϵ Q sao cho:
a) (2x-3). (x+1) < 0.
b) \(\left(x-\frac{1}{2}\right).\left(x+3\right)\)> 0.
2. Tính:
S=\(\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{999.1001}\)
3. Tìm x: Biết x không thuộc{-2; -5; -10; -17}
\(\frac{3}{\left(x+2\right).\left(x+5\right)}+\frac{5}{\left(x+5\right).\left(x+10\right)}+\frac{7}{\left(x+10\right).\left(x+17\right)}=\frac{x}{\left(x+2\right).\left(x+17\right)}\)
\(a,\left(-3\right)^{x+3}=-\frac{1}{27}\)
\(b,\left(-6\right)^{2x+2}=\frac{1}{36}\)
\(c,\left(-3\right)^{x+5}=\frac{1}{81}\)
\(d,\left(\frac{1}{9}^x\right)=\left(\frac{1}{27}\right)^6\)
\(e,\left(\frac{4}{9}\right)^x=\left(\frac{8}{27}\right)^6\)
\(f,5^{x+4}-3.5^{x+3}=2.5^{11}\)
\(r,4.3^{x-1}+2.3^{x+2}=4.3^6+2.3^9\)
\(h,\left(\frac{1}{2}-\frac{1}{3}\right).6x+6^{x+2}=6^{10}+6^7\)
nhờ mấy bn giúp mk tối mình nộp rồi
Tìm x,y sao cho
\(\frac{x+4}{6}=\frac{3y-1}{8}=\frac{3y-x-5}{x}\)
Tìm x thuộc Q biết:
a) 6,5 - \(\frac{9}{4}\): |x+\(\frac{1}{3}\)| = |-2|
b) 2 - |\(\frac{3}{2}x-\frac{1}{4}\)| = |\(-\frac{5}{4}\)|
c) |2x - 3| - |3x+2| = 0
d) |x - 2| + |x - 5| = 6
e) |x - 3| + |x + 5| = 8
Tìm x\
\(\frac{3}{8}-\frac{5}{3}:x+\frac{13}{6}=\frac{5}{4}\)
Tìm các số x và y biết: \(\frac{5}{x}+\frac{y}{4}=\frac{1}{8}\)
Tìm x : \(x+\frac{3}{9}+x+\frac{5}{8}+x+\frac{7}{7}=6\)
Tìm x, biết:
a) \(\frac{x-1}{x-5}=\frac{6}{7}\left(x\ne5\right)\)
b)\(\frac{x^2}{6}=\frac{24}{25}\)
Giúp mk vs đg cần gấp nha cảm ơn mấy bạn nhiều lắm !!!
\(\left(\frac{1}{2}\right)^5.x=\left(\frac{1}{2}\right)^7\)
\(\left(\frac{3}{7}\right)^2.x=\left(\frac{9}{21}\right)^2\)
Bài tìm x biết :
2x=2
3x=34
7x=77
(-3)x=(-3)5
(-5)x=(-5)4
2x=4
2x=8
2x=16
3x+1=32
5x-1=5
6x+4=610
52x-7=511
(-2)4x+2=64
\(\left(\frac{1}{2}\right)^x=\left(\frac{1}{2}\right)^5\)
\(\left(\frac{5}{6}\right)^{2x}=\left(\frac{5}{6}\right)^5\)
\(\left(\frac{3}{4}\right)^{2x-1}=\left(\frac{3}{4}\right)^{5x-4}\)
\(\left(-\frac{1}{10}\right)^x=\frac{1}{100}\)
\(\left(-\frac{3}{2}\right)^x=\frac{9}{4}\)
\(\left(-\frac{3}{5}\right)^{2x}=\frac{9}{25}\)
\(\left(-\frac{2}{3}\right)^x=-\frac{8}{27}\)
