tinh
2448:[119-(23-6)]
[130-3.(5.2^4-5^2.2)]:2^3
5^3.52+5^3.7^2-5^3
2^3.16-2^3.14+56
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a: \(\dfrac{5^5}{5^x}=5^{18}\)
=>5-x=18
hay x=-13
b: \(\dfrac{2^{4-x}}{16^5}=32^6\)
\(\Leftrightarrow2^{4-x}=\left(2^5\right)^6\cdot\left(2^4\right)^5=2^{30+20}=2^{50}\)
=>4-x=50
hay x=-46
c: \(\dfrac{2^{2x-3}}{4^{10}}=8^3\cdot16^5\)
\(\Leftrightarrow2^{2x-3}=2^9\cdot2^{20}\cdot2^{20}=2^{49}\)
=>2x-3=49
=>2x=52
hay x=26
d: \(\dfrac{2^3}{2^x}=4^5\)
\(\Leftrightarrow2^{3-x}=2^{10}\)
=>3-x=10
hay x=-7
e: \(9\cdot5^x=6\cdot5^6+3\cdot5^6\)
\(\Leftrightarrow9\cdot5^x=9\cdot5^6\)
\(\Leftrightarrow5^x=5^6\)
hay x=6
f: \(7\cdot2^x=2^9+5\cdot2^8\)
\(\Leftrightarrow2^x\cdot7=2^8\cdot7\)
\(\Leftrightarrow2^x=2^8\)
hay x=8
\(32-2\left\{3^3-4\left[5^6:5^4-\left(3.7-1\right)\right]\right\}\)
\(=32-2\left[27-4\left(25-20\right)\right]\)
\(=32-2\left(27-100+80\right)\)
\(=32-2.7=32-14=18\)
1. 25 : 5,7 = 250/57
2. 30:2.8.4 = 480
3. 20:2^2.14= 70
4. 125:5^3.170= 170
5. 64:2^5.30.4=240
6. (25:5^2.30): 15.7=14
bạn à! Nhiều quá mình ko làm hết được. sorry nha.^-^
\(2448:\left[119-\left(23-6\right)\right]\)
\(=2448:\left[119-23+6\right]\)
\(=2448:102\)
\(=24\)
\(\left[130-3\left(5.2^4-5^2.2\right)\right]:2^3\)
\(=\left[130-3\left(5.16-25.2\right)\right]:8\)
\(=\left[130-3\left(80-50\right)\right]:8\)
\(=\left[130-3.30\right]:8\)
\(=\left[130-90\right]:8\)
\(=40:8=5\)
\(5^3.52+5^3.7^2-5^3\)
\(=5^3.52+5^3.49-5^3\)
\(=5^3\left(52+49-1\right)\)
\(=5^3.100\)
\(=125.100=12500\)
\(2^3.16-2^3.14+56\)
\(=2^3.16-2^3.14+2^3.7\)
\(=2^3\left(16-14+7\right)\)
\(=2^3.9\)
\(=8.9=72\)