\(\left(2^3:4\right).2^{x+1}=64\)
\(\Leftrightarrow2.2^{x+1}=2^6\)
\(\Leftrightarrow2^1.2^{x+1}=2^6\)
\(\Leftrightarrow2^{x+1}=2^6:2^1=2^5\)
\(\Leftrightarrow x=4\)
1)Tìm x, biết :
\(4.\left[3x-1\right]+\left[x\right]-2.\left[x-5\right]+7.\left[x-3\right]=12\)
\(\left[2\dfrac{1}{5}-x\right]+\left[x-\dfrac{1}{5}\right]+8\dfrac{1}{5}=1,2\)
\(3.\left[x+4\right]-\left[2.x+1\right]-5.\left[x-3\right]+\left[x-9\right]=5\)
\(2\left[x+3\dfrac{1}{2}\right]+\left[x\right]-3\dfrac{1}{2}=\left[2\dfrac{1}{5}-x\right]\)
tìm x , biết
a) \(\left|x-2\right|=x\)
b) \(\left|x-3,4\right|+\left|2,6-x\right|=0\)
c) (x+5)3 = -64
d) (2x-3)2 = 9
1) tìm x:
a) 3(x+2)-(x+2)=0
b) (x2+1).(x+2019)=0
c) (x-3)+2x2-6x=0
2) tính :
A=\(\left|x+\frac{3}{2}\right|-\left|x-1\right|+\left|x-\frac{3}{4}\right|\)
tìm x:
(x-3)+2x2-6x=0
tính:
A=\(\left|x+\frac{3}{2}\right|-\left|x-1\right|+\left|x-\frac{3}{4}\right|\)
a, \(\dfrac{\left(-3\right)^x}{81}=-27\)
b, \(2^{x-1}=16\)
c, \(\left(x-1\right)^2=25\)
d, \(0,2-\left|4,2-2x\right|=0\)
e, \(1\dfrac{2}{3}:\dfrac{x}{4}=6:0,3\)
Tìm x biết:
a) \(\left(-\dfrac{2}{3}\right)^2.x=\left(-\dfrac{2}{3}\right)^5\) ; b) \(\left(-\dfrac{1}{3}\right)^3.x=\dfrac{1}{81}\) ; c) (2x-3)\(^2\) ; d) (3x-2)\(^5\) =-243
1Tìm x
a,\(|2X-3|=X-2\)
b,\(\left(2x+3\right)^6-\left(2x+3\right)^4=0\)
\(\left(\dfrac{32}{243}\right)^x=\left(\dfrac{3}{2}\right)^{-1}\)
A =\(\left(\frac{1}{2^2}-1\right)\).\(\left(\frac{1}{3^2}-1\right)\).\(\left(\frac{1}{4^2}-1\right)\).....................\(\left(\frac{1}{2015^2}-1\right)\).\(\left(\frac{1}{2016^2}-1\right)\)
B =\(\frac{-1}{2}\)
so sánh A và B
Giúp mk nha mk đang cần gấp lắm ! Cảm ơn trước!!!!!!!!!!!
