=>\(15x^2+3x+10x+2=15x^2-5x+21x-7\)
=>13x+2=16x-7
=>-3x=-9
=>x=3
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Tìm x, biết:
a) \(\dfrac{3x+2}{5x+7}=\dfrac{3x-1}{5x+1}\)
b) \(\dfrac{x+1}{2x+1}=\dfrac{0,5x+2}{x+3}\)
\(\dfrac{3x+2}{5x+7}=\dfrac{3x-1}{5x-3}\)
b,\(\dfrac{\left|2x-1\right|}{\dfrac{1}{2}}=\dfrac{18}{5}\)
Tìm x ,biết
a,\(\dfrac{1}{3}-\dfrac{2}{5}+3x=\dfrac{3}{4}\)
b,\(\dfrac{3}{2}-1+4x=\dfrac{2}{3}-7x\)
c,\(2.\left(\dfrac{3}{4}-5x\right)=\dfrac{4}{5}-3x\)
d, \(4.\left(\dfrac{1}{2}-x\right)-5.\left(x-\dfrac{3}{10}\right)=\dfrac{7}{4}\)
tìm x;y;z biết:
a, \(\dfrac{x}{6}-\dfrac{1}{y}=\dfrac{1}{2}\)
b, 2x = 3y; 5x = 7z và 3x - 7y + 5z = 30
Tìm x biết:
a, 5x+2>3x-1
b, \(\dfrac{3}{4}.x-\dfrac{1}{2}>\dfrac{1}{2}.x+\dfrac{3}{4}\)
c, (x-2).(x-3)>0
d, (2x+4)(x-5)<0
\(\dfrac{5x^2-7x+1}{3x-1}\) với x=4
a, 4(5x-3)-3(2x+1)=9
b, |x-9|=2x+5
c, \(\dfrac{2}{x-3}+\dfrac{3}{x+3}=\dfrac{3x+5}{x^2-9}\)
tìm x,y,z biết \(\dfrac{3x-2y}{37}=\dfrac{5y-3z}{15}=\dfrac{2z-5x}{2}\) và 10x-3y-2z=-4
rút gọn biểu thức: G=\(\dfrac{3x^2-5x+1}{3x-2}\)