Câu a) (2X-1)2-(X+3)2=0
(2X-1-X-3)(2X-1+X+3)=0
(X-4)(3X+2)=0
-> X-4=0 HOẶC 3X+2=0
xét:X-4=0
X=0+4=4
Xét:3X+2=0
3X=0-2=-2
X= -2:3= -2/3
=>X=4 HOẶC -2/3
CÂU b) 2(X+5)-X2-5X=0
2(X+5)-(x2+5X)=0
2(X+5)-X(x+5)=0
(X+5)(2-x)=0
-> X+5=0 HOẶC 2-X=0
XÉT: X+5=0 XÉT: 2-X=0
X=0-5= -5 X=2-0=2
=>X= -5 HOẶC 2
Tìm x:
a) (3x-2)(2x-1)-(6x2-3x)=0
b) x3-(x+1)(x2-x+1)=x
c) 56x4+7x=0
d) x2-5x-24=0
Tìm x:
a)2.(x+5)-x2-5x=0
b)6x2-7x+2=0
Tìm x:
a) x(x-2)-x+2=0
b) (3-2x)2-(x-1)2=0
c) 81x4-x2=0
d) x3+x2+27x+27=0
Tìm x:
a) x(x-2)-x+2=0
b) (3-2x)2-(x-1)2=0
c) 81x4-x2=0
d) x3+x2+27x+27=0
Tìm x:
a)5x(x-2)-2x+4=0
b)2x(x+1)-(x-2)^2=6
c)2x^2+7x-9=0
Tìm x:
a) 5x+40x4=0
b) 8x2-2x-1=0
c) (3x2+x)2-(3x2+x)-2=0
Tìm x:
a) 5x(x-2)+(2-x)=0
b) x(2x-5)-10x+25=0
c) \(\dfrac{25}{16}\)-4x2+4x-1=0
d)x4+2x2-8=0
Tìm x:
a)2x3-18x=0
b)(3x-2).(2x+1)-6x.(x+2)=11
c)(x-1)3-(x+2).(x2-2x+4)=3.(1-x2)
Tìm x:
a)(x+2)^2-2(x+2)(x-5)=0
b)2x^2+3x-5=0
c)x+2√2x^2+2x^3=0
d)(3x-1)^2-4(x+5)^2=0
Tìm x:
a)x.(x+7)-(x-2).(x+3)=0
b)(x+2)2-(x2-4)=0
