Tính x+y biết 4^x/2^x+y=8 và 9^x+y/3^5y =243
1.Tính x + y :
4x2x+y\dfrac{4^x}{2^{x+y}}2x+y4x = 8 và 9x+y35y\dfrac{9^{x+y}}{3^{5y}}35y9x+y = 243
2.Tìm x, biết :
a) (x−1)3\left(x-1\right)^3(x−1)3 = 343
b) (x−2)4\left(x-2\right)^4(x−2)4 = 4096
c) (x−4)2\left(x-4\right)^2(x−4)2 = (x−4)4\left(x-4\right)^4(x−4)4
2.b,
(x−2)4=4096(x−2)4=(±8)4⇒{x−2=8x−2=−8⇒{x=10x=−6\left(x-2\right)^4=4096\\ \left(x-2\right)^4=\left(\pm8\right)^4\\ \Rightarrow\left\{{}\begin{matrix}x-2=8\\x-2=-8\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=10\\x=-6\end{matrix}\right.(x−2)4=4096(x−2)4=(±8)4⇒{x−2=8x−2=−8⇒{x=10x=−6
Vậy ...
câu c:
(x−4)2=(x−4)4⇒{x−4=0x−4=1⇒{x=4x=5\left(x-4\right)^2=\left(x-4\right)^4\\ \Rightarrow\left\{{}\begin{matrix}x-4=0\\x-4=1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=4\\x=5\end{matrix}\right.(x−4)2=(x−4)4⇒{x−4=0x−4=1⇒{x=4x=5
Vậy
Tìm x biết (2x-1)^2=100
Tim x
(2x−1)2=100\left(2x-1\right)^2=100(2x−1)2=100
Tìm x biết |x+1|+x=2
∣x+1∣+x=2\left|x+1\right|+x=2∣x+1∣+x=2
Tìm x biết -1,2x + 5,8 = 42,2-5,2x
Tìm x , biết :
-1,2x + 5,8 = 42,2-5,2x
Tìm x biết 5|x+1|/2=90/|x+1|
Tìm x
a) (35x−23x−x)⋅17=−5218\left(\dfrac{3}{5}x-\dfrac{2}{3}x-x\right)\cdot\dfrac{1}{7}=-\dfrac{5}{21}8(53x−32x−x)⋅71=−2158
b) (5x−1)⋅(2x+13)=0\left(5x-1\right)\cdot\left(2x+\dfrac{1}{3}\right)=0(5x−1)⋅(2x+31)=0
c) 5∣x+1∣2=90∣x+1∣\dfrac{5\left|x+1\right|}{2}=\dfrac{90}{\left|x+1\right|}25∣x+1∣=∣x+1∣90
Tìm x biết |2x+1|+|x+8|=x
Tìm x biết
1) (x−1)4=16(x−1)2\left(x-1\right)^4=16\left(x-1\right)^2(x−1)4=16(x−1)2
2) ∣2x+1∣+∣x+8∣=x\left|2x+1\right|+\left|x+8\right|=x∣2x+1∣+∣x+8∣=x
Tìm x biết 3,6-|x-0, 4|=0
Tìm x biết:
a) 3,6-|x-0, 4|=0
B) |x-3, 5|=7, 5
Giúp mìk vs
Tìm x biết | x + 1 | + | x + 4 | = 3x
| x + 1 | + | x + 4 | = 3x
Tìm GTNN của biểu thức B= |3x-1|+|4y+2|-3x
Tìm GTNN
B= /3x-1/+/4y+2/-3x
Tìm x, y biết |x-y|+|y+9/25|=0
tìm x;y
b ∣x−y∣+∣y+925=0∣\left|x-y\right|+\left|y+\dfrac{9}{25}=0\right|∣x−y∣+∣∣∣∣y+259=0∣∣∣∣
c (12x−5)20+(y2−14)10=0\left(\dfrac{1}{2}x-5\right)^{20}+\left(y^2-\dfrac{1}{4}\right)^{10}=0(21x−5)20+(y2−41)10=0
a ∣12−13+x∣=−14−y\left|\dfrac{1}{2}-\dfrac{1}{3}+x\right|=\dfrac{-1}{4}-y∣∣∣∣21−31+x∣∣∣∣=4−1−y
d ∣x(x2−54)∣=x\left|x\left(x^2-\dfrac{5}{4}\right)\right|=x∣∣∣∣x(x2−45)∣∣∣∣=x (x≥0)\left(x\ge0\right)(x≥0)
e x2+(y−110)4=0x^2+\left(y-\dfrac{1}{10}\right)^4=0x2+(y−101)4=0
Tìm x biết |x^2-2x|=x
tìm x biết: |x2 - 2x| = x