x-25%x=1/2
x-1/4x=1/2
x(1-1/4)=1/2
x.3/4=1/2
x=1/2:3/4
x=1/2.4/3
x=4/6=2/3
x-25%x=1/2
x-1/4x=1/2
=>3/4x=1/2
=>x=1/2:3/4
=>x=2/3
tìm x biết :
a) \(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
b) \(-1\frac{5}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
c) \(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
Tìm x:x2=x
Tìm x biết:
25%x + x - \(\frac{1}{5}\)x = \(\frac{1}{5}\)\(\frac{2}{3}\)x - \(\frac{1}{2}\)x = \(\frac{3}{5}\)\(\frac{2}{5}\)x - \(1\frac{1}{2}\)x + x =\(\frac{1}{3}\)\(\left(x+\frac{2}{7}\right).\left(\frac{2}{3}-2x\right)=0\)Tìm x :
\(\frac{3x-1}{40-5x}=\frac{25-3x}{5x-34}\)
bài 1/
\(\frac{7.25-49}{7.24+21}\)
bài 2/
Tìm một số, biết:\(\frac{2}{5}\)% của nó bằng 1,5
bài 3/Tìm x biết:
15-(15-x)=-x-(25+9)
giúp mk với nha mk cần gấp
thanhk you
Tìm x,biết:
a/ \(\frac{x}{3}-\frac{10}{21}=\frac{-1}{7}\)
b/x-25%=\(\frac{1}{2}\)
c/ \(\frac{-5}{6}+\frac{8}{3}+\frac{-29}{6}\le x\le\frac{-1}{2}+2+\frac{5}{2}\)
Tìm x biết \(\frac{x}{25}\)+\(\frac{x}{40}\)=\(\frac{11}{5}\)
Tìm x biết:
3x-75=45+3.(-25)
b) \(\frac{x}{3}=\frac{2}{3}+\frac{-1}{7}\)
x - \(\frac{25}{100}\).x =\(\frac{1}{2}\)
Giúp mình nhé