3x+2+3x=8
giai ho voi
tim dkxd cua 3x-1/9x^2-1
giai thich ho minh luon voi. cam on
c, -(2x-7)-x(3x+1)=0
giai ho toi cau nay voi
=>-2x+7-3x^2-x=0
=>-3x^2-3x+7=0
=>\(x=\dfrac{-3\pm\sqrt{93}}{6}\)
\(c.-\left(2x-7\right)-x\left(3x+1\right)=0\)
\(\Leftrightarrow-2x+7-3x^2-x=0\)
\(\Leftrightarrow-3x^2-3x+7=0\)
Vậy pt này vô n0
3x + 5y = 42 nhanh ho minh voi
( 3x-2 )2 -2x( 3x+8 ) = 0
Giup minh voi thank nhieu
\(\Leftrightarrow9x^2-12x+4-6x^2-16x=0\)
\(\Leftrightarrow3x^2-28x+4=0\)
\(\text{Δ}=\left(-28\right)^2-4\cdot3\cdot4=736>0\)
Do đó: Phương trình có hai nghiệm phân biệt là:
\(\left\{{}\begin{matrix}x_1=\dfrac{28-4\sqrt{46}}{6}=\dfrac{14-2\sqrt{46}}{3}\\x_2=\dfrac{14+2\sqrt{46}}{3}\end{matrix}\right.\)
Giai phuong trinh giup minh voi:
\(\frac{\left(3x+1\right)\left(3x-2\right)}{3}+5\left(3x-1\right)=\frac{2\left(2x+1\right)\left(3x+1\right)}{3}+2x\left(3x+1\right)\)
3x + 2\(\sqrt{3x-1}\)=14 moi nguoi giup minh voi
ĐKXĐ: \(x\ge\frac{1}{3}\)
\(3x+2\sqrt{3x-1}=14\)
\(2\sqrt{3x-1}=14-3x\)
Bình phương 2 vế với điều kiện \(x\le\frac{14}{3}\)
\(\Rightarrow4\left(3x-1\right)=196-84x+9x^2\)
\(12x-4=196-84x+9x^2\)
\(9x^2-96x+200=0\)
\(\Delta=b^2-4ac=2016>0\)
=> phương trình có 2 nghiệm
\(x_1=\frac{16+2\sqrt{14}}{3}\)
\(x_2=\frac{16-2\sqrt{14}}{3}\)
Vậy ....
Tim x biet: (\(2x^2+7\))x(\(-3x-9\))<\(0\)
Giup mik voi ai nhanh mik tik cho^-^
Nho lam day du ho mik nhe,Thanks=))
ta thấy \(2x^2+7>0\)
\(=>-3x-9< 0\)
\(=>-3x< 9\)
\(=>x>-3\)
vậy...
giup voi
tim x biet
2/3x^2-5x+2 + 13/3x^2+x+2 = 6/x
Giup em voi a
Giai cac bat phuong trinh sau va bieu dien tap nghiem cua bat phuong trinh tren truc so:
a. 2(3x-1)-2x<2x-1
b. 4x-8≥3(3x-2)+4-2x
c. 3(x-2)(x+2)<3x²+x
d. (x+4)(5x-1)>5x²+16x+2
a: =>6x-2-2x<2x-1
=>4x-2<2x-1
=>2x-1<0
=>x<1/2
b: =>4x-8>=9x-6+4-2x
=>4x-8>=7x-2
=>-3x>=6
=>x<=-2
c: =>3x^2-12<3x^2+x
=>x>-12
d: =>5x^2-x+20x-4>5x^2+16x+2
=>19x-4>16x+2
=>3x>6
=>x>2
F = ( 2x 1) . (4x2 + 2x + 1 - 4x ) . (2x2 - 3 ) voi x = mot phan hai
G = ( 3x + 7 ) . ( 2x + 3 ) - ( 3x + 5 ) . ( 2x + 1 ) voi x = 2017
May ban oi cau hoi nay la rut gon xong roiu moi tinh nah