\(\dfrac{3x-1}{40-5x}=\dfrac{25-3x}{5x-34}\\ \Leftrightarrow\left(3x-1\right)\left(5x-34\right)=\left(25-3x\right)\left(40-5x\right)\\ \Leftrightarrow15x^2-102x-5x+34=1000-125x-120x+15x^2\\ \Leftrightarrow15x^2-15x^2-102x-5x+125x+120x=1000-34\\ \Leftrightarrow138x=966\\ \Leftrightarrow x=\dfrac{966}{138}\\ \Leftrightarrow x=7\)
a.Tìm x,y,z biết:
\(\dfrac{2x-4y}{3}=\dfrac{4z-3x}{2}=\dfrac{2y-2z}{4}\)và 2x-y+z=27
b.5x=8y=3z và x-2y+z=34
Giúp mình nha mai mình học ấy
2xy.(-3x^3+5x-1)=
a) |x+2| + |x+\(\dfrac{3}{5}\) | + |x+\(\dfrac{1}{2}\)| = 4x
b) |x+ 5,8| = 3x
c) |x + \(\dfrac{2}{5}\)| = 2x
cho \(\dfrac{x}{-4}=\dfrac{y}{-7}=\dfrac{z}{3}\)tính giá trị biểu thức\(A=\dfrac{-2x+y+5z}{2x-3x-6z}\)với x,y,z\(\ne\)0 và 2x-3y-6z\(\ne\)0
tìm x, biết:
a, 1\(\dfrac{2}{5}\)x+\(\dfrac{4}{5}\)=-\(\dfrac{7}{10}\)
b, 5-3x=2\(\dfrac{2}{7}\)
Cho hàm số y=3x -1 . Lập bảng giá trị tương ứng khi y khi x = -1 ; \(-\dfrac{1}{2}\) ; \(\dfrac{1}{2}\); 1;\(\dfrac{3}{2}\)
Cho \(\dfrac{3x-2y}{4}=\dfrac{2z-4x}{3}=\dfrac{4y-3z}{2}\)
Chứng minh rằng: \(\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{4}\)
Help me, please!
\(\left|x-0,5\right|\)=\(\dfrac{7}{2}\)
\(x:\dfrac{3}{8}+\dfrac{5}{8}=x\)
\(\dfrac{5}{6}-\left|x-\dfrac{1}{2}\right|\)=\(\dfrac{15}{18}\)
\(\dfrac{-7}{12}\)-\(\dfrac{2}{3}\):x=\(\dfrac{-5}{8}\)
\(\left(5x-3\right)^2-\dfrac{1}{64}=0\)
9.27\(\le\)\(3^x\) \(\le\)243
\((x-\dfrac{1}{2})^3\) =8
\(\dfrac{x-3}{5-x}=\dfrac{5}{7}\)
a, Biểu thức x\(^2\) + 5x (âm)
b, ________ (2x + 3 ) (3x + 5) (âm)
c,_________ 2x\(^2\) - 4x ( dương)
d, _________ (3x + 1) (4x - 3) (dương)
