x2(x+2)2+4x2=12(x+2)2
=>x2(x+2)2+4x2-12(x+2)2=0
VT=(x2-2x-4)(x2+6x+12)
pt trở thành (x2-2x-4)(x2+6x+12)=0
=>x2-2x-4=0 hoặc x2+6x+12=0
Th1:x2-2x-4=0
denta:(-2)2-(-4(1.4))=20
x1:(2+\(\sqrt{20}\)):2=1+\(\sqrt{5}\)
x2:(2-\(\sqrt{20}\)):2=\(\sqrt{5}\)+1
Th2:x2+6x+12=0
denta:62-4(1.12)=-12
=>\(\Delta< 0\)
=>vô nghiệm
vậy pt có nghiệm là 1-\(\sqrt{5}\)và \(\sqrt{5}\)+1
cho phuong trinh ( a^2 - 2a -3)x + a^2 = 9. Giai phuong trinh theo tham so a
cho phuong trinh an x: \(\frac{x+a}{x+2}+\frac{x-2}{x-a}=2\)
a) giai phuong trinh vs a=4
b)Tim cac gtri cua a sao cho phuong trinh nhan x=-1 lam nghiem
Giai phuong trinh sau: \(\frac{x^2+2x+2}{x+1}+\frac{x^2+8x+20}{x+4}=\frac{x^2+4x+6}{x+2}+\frac{x^2+6x+12}{x+3}\)
Giai bat phuong trinh
(x+1/x+1)*(x+2/x+1)=12/x
Nhanh gium nhe mk can gap rui
Giai phuong trinh, bat phuong trinh sau:
x-3/x-2 + x-2/x-4 = 16/5x-4/5 - x + 4 > x/3 - x-2/2 Giai giup minh nhe. Cam on rat nhieu.cho phuong trinh (an x):(m-1)x +m^2 -1=0(1) a,giai phuong trinh (1) voi m=2 b, tim gia tri cua m sao cho phuong trinh (1) nhan x=3 lam nghiem
mk dang can gap .cam on truoc a
giai phuong trinh (x-1)(x-4) + (x-3)(x-2)=2
giai phuong trinh x^2+2x+3=(x^2+x+1)(x^4+x^2+4)
Giai phuong trinh x^2+(1/x^2)+16y^2+(1/y^2)=10
