\(3x^2-15x=0\\ \Leftrightarrow3x\left(x-5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}3x=0\\x-5=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=5\end{matrix}\right.\)
a)15x^2 -3x=0
b)(3x -2)(x +3)+(x^2 -9)=0
c)(x -1)^3 -(x +1)(2 -3x)=0
2x^2 (x+5) - 3x^2 - 15x = 0
Tìm x
a,15x3-15x=0 b,3x2-6x+3=0
c,5(x-1)-3x(1-x)=0 d,6x-(x+2)2-5=(1-3x)3-12x
e,-7(x+2)=2x(x+2) f,(2x-3)(3x+5)=(x-1)(3x+5)
g(x2-3x+1)2-(x2-x+4)2=0
tks ae
Tìm x
a) 15x2-3x=0
b) (3x-2) (x+3)+ (x2-9)=0
c) (x-1)3- (x+1) (2-3x)=-3
Tìm x a)(5x-3)(3x+1)-(15x+1)(x-2)=0 b)x²+(x+5)(x-3)-25=0
Tìm x, biết:
a) 8 x 3 - 50x = 0;
b) 2(x + 3)- x 2 - 3x = 0;
c) 6 x 2 - 15x - (2x - 5)(2x + 5) = 0.
bài 49; tìm x;
1, 3x ( x - 7) 2x - 14 = 0
2, x mũ 3 + 3x mũ 2 - ( x + 3) = 0
3, 15x - 5 + 6x mũ 2 - 2x = 0
4, 5x - 2 - 25x mũ 2 + 10x = 0
giải phương trình: (2x2-3x-1)2-10x2-15x+9=0
bài 9; tìm x
1, 3x( x - 7) 2x - 14 = 0
2, x mũ 3 + 3x mũ 2 - ( x + 3 )= 0
3, 15x - 5 + 6x mũ 2 - 2x =0
4, 5x - 2 - 25x mũ 2 + 10x = 0
