Tim x:
7-/x/).(2x-4)=0
cam on da giai gium nah
Những câu hỏi liên quan
Tim cac so nguyen x, y biet: x/4 - 1/y =1/2 ( giai chi tiet gium minh nha cac bn . Cam on nhiu!!!!!! )
Theo để ra ta có
\(\frac{x}{4}-\frac{1}{y}=\frac{1}{2}\)
<=>\(\frac{xy-4}{4y}=\frac{1}{2}\)
<=>\(2xy-8=4y\)
<=>2xy-4y-8=0
<=>2y(x-2)=8
Vì x,y thuộc Z nên ta có
| 2y | 1 | 8 | -8 | -1 | 2 | 4 | -2 | -4 |
| x-2 | 8 | 1 | -1 | -8 | 4 | 2 | -4 | -2 |
| y | 1 | 4 | -4 | -1 | 1 | 2 | -1 | -2 |
| x | 10 | 3 | 1 | -6 | 6 | 4 | -2 | 0 |
Nhớ tick cho mình nha Nguyệt,cảm ơn bạn nhìu.
Đúng 0
Bình luận (0)
tim nghiem da thuc A(x)=x3-2,5x2-4,5x+11
giai gium minh bai nay nhe
tim x
3,2×X+(-1,2)×X+2,7=-4,9
toi can gap giai gium di xin cam on
\(3,2\times x+\left(-1,2\right)\times x+2,7=-4,9\)
\(\left(3,2-1,2\right)x=-4,9-2,7\)
\(2x=-7,6\)
x=-3,8
Đúng 0
Bình luận (0)
C(x)= -2x^2 + mx - 7m + 3
da thuc C(x) co nghiem la -1
Cac ban giai ra ro rang gium minh nhe
(x - 2)(3x + 5) = (2x - 4)(x + 1) giai gium mik dc k
<=>\(3x^2-x-10=2x^2+x-6\)
<=> \(3x^2-x-10-2x^2+2x+6=0\)
<=>\(x^2+x-6=0\)
<=>\(\left(x+3\right)\left(x-2\right)=0\)
<=>\(\orbr{\begin{cases}x+3=0\\x-2=0\end{cases}}\)
<=> \(\orbr{\begin{cases}x=-3\\x=2\end{cases}}\)
(x - 2)(3x + 5) = (2x - 4)(x + 1)
<=>(x - 2)(3x + 5) - (2x - 4)(x + 1) =0
<=>(x - 2)(3x + 5) - 2(x - 2)(x + 1) = 0
<=> ( x - 2)( 3x + 5 - 2x - 2) = 0
<=> (x - 2)( x - 3) = 0
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}}\)
Vậy..........
3x + 5 - 2x - 2 = x - 3??? Sai nhưng đc 3 đúng???
Tim min cua \(C=\frac{2x+1}{x^2+2}\)
CAC BN GIAI CHI TIET GIUM MK NHA !
2C = 4x+2/x^2+2
2C + 1 = 4x+2+x^2+2/x^2+2
= x^2+4x+4/x^2+2
= (x+2)^2/x^2+2 > = 0
<=> 2C >= -1
<=> C >= -1/2
Dấu "=" xảy ra <=> x+2=0 <=> x=-2
Vậy Min của C = -1/2 <=> x=-2
Đúng 0
Bình luận (0)
2C = 4x+2/x^2+2
2C + 1 = 4x+2+x^2+2/x^2+2
= x^2+4x+4/x^2+2
= (x+2)^2/x^2+2 > = 0
<=> 2C >= -1
<=> C >= -1/2
Dấu "=" xảy ra <=> x+2=0 <=> x=-2
Vậy Min của C = -1/2 <=> x=-2
Tk mk nha
Đúng 0
Bình luận (0)
2) tim x biet
a) (3x-5)2-(x+1)2=0
b) (5x-4)2-49x2=0
c) 4x3-36x=0
d) (2x+3) (r-1)+(2x-3) (1-x)=0 giai gium minh
a. \(\left(3x-5\right)^2-\left(x+1\right)^2=0\Leftrightarrow\left(3x-5+x+1\right)\left(3x-5-x-1\right)=0\Leftrightarrow\left(4x-4\right)\left(2x-6\right)=0\Leftrightarrow\left[{}\begin{matrix}4x-4=0\\2x-6=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=3\end{matrix}\right.\)
Vậy ...
b. \(\left(5x-4\right)^2-49x^2=0\Leftrightarrow\left(5x-4\right)^2-\left(7x\right)^2=0\Leftrightarrow\left(5x-4-7x\right)\left(5x-4+7x\right)=0\Leftrightarrow\left(-2x-4\right)\left(12x-4\right)=0\Leftrightarrow\left[{}\begin{matrix}-2x-4=0\\12x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=\dfrac{1}{3}\end{matrix}\right.\)
Vậy ...
c. \(4x^3-36x=0\Leftrightarrow4x\left(x^2-9\right)=0\Leftrightarrow4x\left(x-3\right)\left(x+3\right)=0\Leftrightarrow\left[{}\begin{matrix}4x=0\\x-3=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\)
Vậy ...
d. \(\left(2x+3\right)\left(x-1\right)+\left(2x-3\right)\left(1-x\right)=0\Leftrightarrow\left(2x+3\right)\left(x-1\right)-\left(2x-3\right)\left(x-1\right)=0\Leftrightarrow\left(x-1\right)\left(2x+3-2x+3\right)=0\Leftrightarrow6\left(x-1\right)=0\Leftrightarrow x-1=0\Leftrightarrow x=1\)
Vậy ...
Đúng 0
Bình luận (1)
tim so nguyen X Y thuoc Z biet
(X-7) x (X x Y + 1)=7
giai gium minh nha !!!!
thank you very much !!!!!!!!!!!!!!
tim x biet
\(\sqrt{x-7}=x-1\)
mk dg can gap, ai giai ki gium mk nha