(x + 2)3 - (x - 1)3 = (3x - 1)(3x + 1)
\(\Leftrightarrow\) x3 + 6x2 + 12x + 8 - x3 + 3x2 - 3x + 1 = 9x2 - 1
\(\Leftrightarrow\) 9x2+ 9x + 9 - 9x2 + 1 = 0
\(\Leftrightarrow\) 9x + 10 = 0
\(\Leftrightarrow\) x = \(\frac{10}{9}\)
Vậy S = {\(\frac{10}{9}\)}
1,Giải PT sau
a,\(\frac{4}{5}x-3=\frac{1}{5}x\left(4x-15\right)\)
b,(x-3)-\(\frac{\left(x-3\right)\left(2x-5\right)}{6}=\frac{\left(x-3\right)\left(3-x\right)}{4}\)
c,\(\frac{\left(3x+1\right)\left(3x-2\right)}{3}+5\left(3x+1\right)=\) \(\frac{2\left(2x+1\right)\left(3x+1\right)}{3}+2x\left(3x+1\right)\)
Giải các phương trình sau :
a) \(\left(x-1\right)\left(5x+3\right)=\left(3x-8\right)\left(x-1\right)\)
b) \(3x\left(25x+15\right)-35\left(5x+3\right)=0\)
c) \(\left(2-3x\right)\left(x+11\right)=\left(3x-2\right)\left(2-5x\right)\)
d) \(\left(2x^2+1\right)\left(4x-3\right)=\left(2x^2+1\right)\left(x-12\right)\)
e) \(\left(2x-1\right)^2+\left(2-x\right)\left(2x-1\right)=0\)
f) \(\left(x+2\right)\left(3-4x\right)=x^2+4x+4\)
Giải phương trình:
a) \(x^2-\left(x+3\right)\left(3x+1\right)=9\).
b) \(x^3+4x+5=0\).
c) \(\left(x+14\right)^3-\left(x+12\right)^3=1352\).
d) \(x^3+\left(x-3\right)^3=\left(2x-3\right)^3\).
e) \(x\left(x+1\right)\left(x+2\right)\left(x+3\right)=360\).
f) \(x^3+\left(x-2\right)\left(2x+1\right)=8\).
tìm x biết
\(9\left(x+2\right)-3\left(x+2\right)=0\)
\(x\left(x+5\right)+\left(x-3\right)\left(x+5\right)=0\)\(3x^2+6x=0\)
\(2\left(2x-5\right)-3x=0\)
\(\left(x-1\right)^2+x\left(5-x\right)=0\)
\(\left(2x-3\right)\left(2x+3\right)-\left(x+5\right)^2-3\left(x-1\right)\left(x+2\right)\)=0
\(\left(2x-1\right)^2-45=0\)
\(2x^2-6x=0\)
giúp vs can gap
Giải pt:
a, \(\dfrac{1}{27}.\left(x-3\right)^2-\dfrac{1}{125}.\left(x-5\right)^3=0\)
b, \(125x^3-\left(2x+1\right)^3-\left(3x-1\right)^3=0\)
c, \(\left(x-3\right)^3+\left(x+1\right)^3=8.\left(x-1\right)^3\)
Giải các phương trình :
a) \(x\left(2x-9\right)=3x\left(x-5\right)\)
b) \(0,5x\left(x-3\right)=\left(x-3\right)\left(1,5x-1\right)\)
c) \(3x-15=2x\left(x-5\right)\)
d) \(\dfrac{3}{7}x-1=\dfrac{1}{7}x\left(3x-7\right)\)
Giải các phương trình :
a) \(2x^3+6x^2=x^2+3x\)
b) \(\left(3x-1\right)\left(x^2+2\right)=\left(3x-1\right)\left(7x-10\right)\)
Giải các phương trình sau:
a) \(\left(x^2-4\right)\left(2x+3\right)=\left(x^2-4\right)\left(x-1\right)\)
b) \(\left(3x-7\right)^2-4\left(x+1\right)^2=0\)
giúp mk chiều rùi
bài 1
a,\(\left(x-4\right)^2-25=0\)
b,\(\left(x-3\right)^2-\left(x+1\right)^2=0\)
c,\(\left(x^2-4\right)\left(21+3\right)=\left(x^2-4\right)\left(x-1\right)\)
d,\(\left(3x-7\right)^2-4\left(x+1\right)^2=0\)
