Giup minh voi : TIM X:-x.(8.x)=0
tim x biet: (x-3)*(x-5)+1=0 giup minh voi. Arigato gozaimasu!
\(\left(x-3\right)\left(x-5\right)+1=0\)
\(\Leftrightarrow x^2-5x-3x+15+1=0\)
\(\Leftrightarrow x^2-8x+16=0\)
\(\Leftrightarrow\left(x-4\right)^2=0\)
\(\Leftrightarrow x-4=0\)
\(\Leftrightarrow x=4\)
Vậy \(x=4\)
\(\left(x-3\right)\left(x-5\right)+1=0\)
\(\Rightarrow x^2-3x-5x+15+1=0\)
\(\Rightarrow x^2-8x+16=0\)
\(\Rightarrow x^2-2x.4+4^2=0\)
\(\Rightarrow\left(x-4\right)^2=0\)
\(\Rightarrow x-4=0\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
\(\left(x-3\right)\left(x-5\right)+1=0\)
\(\Leftrightarrow x^2-5x-3x+15+1=0\)
\(\Leftrightarrow x^2-8x+16=0\)
\(\Leftrightarrow\left(x-4\right)^2=0\)
\(\Leftrightarrow x=4\)
tim x: (x+2)^4_4×(x+2)^2=0 giup minh voi
Giup minh cau nay voi
Tim x biet:x^3-x^2=0
x3-x2=0
x2(x-1)=0
Suy ra
x2=0 su ra x=0
x-1=0 suy ra x=1
3-x2 =0
3-x=0:2
3-x = 0
x= 3-0
x = 3
Tim x : x^3-x^2-x+1=0
Chung minh 2x-2x^2-1<0 voi moi x
Giup vs
Bài 1:
\(x^3-x^2-x+1=0\)
\(\Leftrightarrow x^2\left(x-1\right)-\left(x-1\right)=0\)
\(\Leftrightarrow\left(x^2-1\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left(x-1\right)^2\left(x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\x+1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
Vậy x = 1 hoặc x = -1
Bài 2:
\(2x-2x^2-1=-2\left(x^2-x+\dfrac{1}{2}\right)\)
\(=-2\left(x^2-2.x.\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{4}\right)\)
\(=-2\left(x^2-\dfrac{1}{2}\right)^2-\dfrac{1}{2}< 0\)
\(\Rightarrowđpcm\)
tim x
(3/8 - x)^3 * 1/16 = 50%
giup minh voi nhe !!
(3/8 - x)^3*1/16=50%
=> (3/8 - x)^3=50% chia cho 1 phần 16
=> (3/8 - x)^3=8
=> (3/8 - x)^3=3^3
=> 3/8 - x=8
=> x=3/8 - 8
=> x= - 61/8
( 3/8 - x )3 . 1/16 = 50%
<=> ( 3/8 - x )3 . 1/16 = 1/2
<=> ( 3/8 - x )3 = 1/6 . 16
<=> ( 3/8 - x )3 = 8/3
<=> ( 3/8 - x ) = 2/3
<=> x = 3/8 - 2/3
<=> x = -7/24
tim so nguyen x biet
a) (x + 3)(x - 1)<0
b) (x - 4)(x + 3)>0
GIUP MINH VOI
a/[x-2][7-x] > 0 . tim x thuoc Z
b/[x mu 2+13][x mu 2-17] > 0 . tim x thuoc Z
c/[x mu 2-13][x mu 2-17] <0 . tim x thuoc Z
GIUP MINH VOI
NGAY KIA MINH DI BOI DUONG ROI
CAM ON CAC BAN NEU CAC BAB GIUP MINH
a, => [x-2] và [7-x] cùng dấu
Xét 2 trường hợp cùng >0 và cùng<0
b, tương tự
c, xét 2 trường hợp khác dấu
Có gì ko h bạn cứ hỏi nha!
tim cac so nguyen to x,y sao cho x^2-2y^2-1=0 GIUP MINH VOI
tim x biet :2*x-12*x=0. cac ban oi giup minh giai cau nay voi
2.x - 12.x = 0
=> 2 - 12 . x = 0
=> - 10.x = 0
=> x = 0 : ( - 10 )
=> x = 0
????
\(2\times x-12\times x=0\)
\(\left(2-12\right)\times x=0\)
\(-10\times x=0\)
\(x=0:\left(-10\right)\)
\(x=0\)
Vậy x = 0