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
a,
(35x−23x−x)⋅17=−521\left(\dfrac{3}{5}x-\dfrac{2}{3}x-x\right)\cdot\dfrac{1}{7}=-\dfrac{5}{21}(53x−32x−x)⋅71=−215
⇒−1615x⋅17=−521\Rightarrow\dfrac{-16}{15}x\cdot\dfrac{1}{7}=-\dfrac{5}{21}⇒15−16x⋅71=−215
⇒−1615x=−52117=−53\Rightarrow\dfrac{-16}{15}x=\dfrac{-\dfrac{5}{21}}{\dfrac{1}{7}}=-\dfrac{5}{3}⇒15−16x=71−215=−35
⇒x=−53−1615=2516\Rightarrow x=\dfrac{-\dfrac{5}{3}}{-\dfrac{16}{15}}=\dfrac{25}{16}⇒x=−1516−35=1625
b,
(5x−1)(2x+13)=0\left(5x-1\right)\left(2x+\dfrac{1}{3}\right)=0(5x−1)(2x+31)=0
⇒[5x−1=02x+13=0⇔[x=15x=−16\Rightarrow\left[{}\begin{matrix}5x-1=0\\2x+\dfrac{1}{3}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{5}\\x=-\dfrac{1}{6}\end{matrix}\right.⇒[5x−1=02x+31=0⇔⎣⎢⎡x=51x=−61
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
⇒5∣x+1∣2=180\Rightarrow5\left|x+1\right|^2=180⇒5∣x+1∣2=180
⇒∣x+1∣2=36\Rightarrow\left|x+1\right|^2=36⇒∣x+1∣2=36
Mà ∣x+1∣≥0\left|x+1\right|\ge0∣x+1∣≥0
=> x + 1 = 6 <=> x = 7
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
So sánh A = 7^2012 + 1 / 7^2013 + 1 và B = 7^2013 + 1 / 7^2014 + 1
So sánh A và B biết A = 72012 + 1 / 72013 + 1 và B = 72013 + 1 / 72014 + 1
So sánh 2^91 và 5^35
so sánh 291 và 535
Tìm x biết (1/3-1/2)^x-1=1/36
tìm x biết: (13−12)x−1=136\left(\dfrac{1}{3}-\dfrac{1}{2}\right)^{x-1}=\dfrac{1}{36}(31−21)x−1=361
So sánh S=(1/2^2-1)(1/3^2-1)(1/4^2-1)...((1/2015^2-1)(1/2016^2-1) và -1/2
So sánh: S và -1/2 biết S=(1/2^2-1)(1/3^2-1)(1/4^2-1)...((1/2015^2-1)(1/2016^2-1)
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