\(25\le5^{x+1}\le625\Leftrightarrow5^2\le5^{x+1}\le5^4\)
\(\Leftrightarrow2\le x+1\le4\)
\(\Rightarrow x\in\left(1;2;3\right)\)
BT1: Tìm x, biết:
3) \(6.8^{x-1}+8^{x+1}=6.8^{19}+8^{20}\left(x\in N\right)\)
BT1: Tìm x, biết:
1) \(\left[\left(\dfrac{1}{2}x-\dfrac{1}{3}\right)^2+\dfrac{1}{4}\right]^3=\dfrac{1}{8}\)
BT1: Tìm x, biết:
5) \(\dfrac{1}{2}+\dfrac{1}{3}< x\le1\dfrac{1}{2}+\dfrac{1}{5}\left(x\in Z\right)\)
BT1: Tìm x, biết:
1) \(x+\dfrac{1}{4}=\dfrac{3}{5}-\left(-\dfrac{1}{3}\right)\)
BT1: Tìm x, biết:
2) \(9-\left(\dfrac{2}{3}-x\right)=-\dfrac{5}{4}\)
BT1: Tìm x, biết:
1) \(\dfrac{1}{3}-\left(1\dfrac{1}{2}-x\right)=0,3\)
BT1: Tìm x, biết:
2) \(0,28-0,3:\left(50\%.x-1\dfrac{1}{3}\right)=-1\dfrac{2}{3}\)
BT1: Tìm x, biết:
6) \(\dfrac{1}{2}.\left(\dfrac{1}{3}x-\dfrac{1}{5}\right)^2-\dfrac{1}{5}=-\dfrac{3}{40}\)
1)Tính giá trị biểu thức:
\(\dfrac{\left(13\dfrac{1}{4}-2\dfrac{5}{27}-10\dfrac{5}{6}\right).230\dfrac{1}{25}+46\dfrac{3}{4}}{\left(1\dfrac{3}{7}+\dfrac{10}{3}\right):\left(12\dfrac{1}{3}-14\dfrac{2}{7}\right)}\)
2)Tìm x biết:
a) \(42+\dfrac{3}{7}.\left|3x-1\right|=12\)
b) \(\left|2x-1\right|=\left|x+2\right|\)
c) \(2.3^x.3^2=18\) với \(x\in N\)
