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\(a,\left(7x-11\right)^3=2^5.5^2+200\)
\(\Leftrightarrow\left(7x-11\right)^3=32.25+200\)
\(\Leftrightarrow\left(7x-11\right)^3=800+200\)
\(\Leftrightarrow\left(7x-11\right)^3=1000\)
\(\Leftrightarrow\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(\Rightarrow7x=21\)
\(\Rightarrow x=3\)
\(b,3^2.x^2-2^2.x^2=5^5-\left(255:51\right).11\)
\(\Rightarrow x^2\left(3^2-2^2\right)=3125-5.11\)
\(\Rightarrow x^2\left(9-4\right)=3125-55\)
\(\Rightarrow5x^2=2970\)
\(\Rightarrow x^2=2970:5\)
\(\Rightarrow x^2=594\)
\(\Rightarrow x=3\sqrt{66}\)
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1. Tính giá trị biểu thức:
\(777:7+1331:11^3\)
\(=111+11^3:11^3\)
\(=111+1\)
\(=112\)
1.
\(777:7+1331:11^3=111+1331:1331=111+1=112\)
2.
\(2^{x+3}+2^x=36\\ 2^x\left(1+2^3\right)=36\\ 2^x\cdot9=36\\ 2^x=4\\ x=2\)
\(3^{x+4}+3^{x+2}=270\\ 3^{x+2}\cdot\left(3^2+1\right)=270\\ 3^{x+2}\cdot10=270\\ 3^{x+2}=27\\ x+2=3\\ x=1\)
\(\left(2x-5\right)^5=3^{10}\\ \left(2x-5\right)^5=3^{2\cdot5}\\ \left(2x-5\right)^5=\left(3^2\right)^5\\ \left(2x-5\right)^5=9^5\\ 2x-5=9\\ 2x=14\\ x=7\)
3.
\(31^{11}< 32^{11}=\left(2^5\right)^{11}=2^{55}\\ 17^{14}>16^{14}=\left(2^4\right)^{14}=2^{56}>2^{55}\\ \Rightarrow31^{11}< 17^{14}\)
\(5^{300}=5^{2\cdot150}=\left(5^2\right)^{150}=25^{150}\\ 3^{453}=3^{3\cdot151}=\left(3^3\right)^{151}=27^{151}\\ 25^{150}< 25^{151}< 27^{151}\\ \Leftrightarrow5^{300}< 3^{453}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(4^2-2^2.3+8.5^0\)
\(=16-4.3+8.1\)
\(=12\)
\(5^4.\left[8^2:4^2.\left(2^3+10^0\right)\right]\)
\(=625.\left[64:16.\left(8+1\right)\right]\)
\(=625.\left(64:16.9\right)\)
\(=22500\)
\(11^2.5^3-11^2.25\)
\(=11^2.\left(5^3-25\right)\)
\(=121.\left(125-25\right)\)
\(=12100\)
học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Rightarrow\left(7x-11\right)^3=32.25+200\)
\(\Rightarrow\left(7x-11\right)^3=800+200\)
\(\Rightarrow\left(7x-11\right)^3=1000\)
\(\Rightarrow\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(\Rightarrow7x=10+11\)
\(\Rightarrow7x=21\)
\(\Rightarrow x=21:7\)
\(\Rightarrow x=3\)
Vậy x = 3
b) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)
\(\Rightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\)
\(\Rightarrow\left(2x-15\right)^3\left[\left(2x-15\right)^2-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{cases}}\Rightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2=1\end{cases}}\)
TH 1 : \(\left(2x-15\right)^3=0\Rightarrow2x-15=0\Rightarrow2x=15\Rightarrow x=\frac{15}{2}\)
TH 2 : \(\left(2x-15\right)^2=1\Rightarrow\orbr{\begin{cases}2x-15=1\\2x-15=-1\end{cases}}\Rightarrow\orbr{\begin{cases}2x=16\\2x=14\end{cases}}\Rightarrow\orbr{\begin{cases}x=8\\x=7\end{cases}}\)
Vậy \(x\in\left\{\frac{15}{2};8;7\right\}\)
_Chúc bạn học tốt_
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(93+3\left(x-5\right)=3.5^2=75\\ =>3\left(x-5\right)=75-93=-18\\ =>x-5=\dfrac{-18}{3}=-6\\ =>x=-6+5=-1\)
b, \(\left(5x^3+2^2.11\right):3^2=5\\ < =>\left(5x^3+44\right):9=5\\ =>5x^3+44=5.9=45\\ =>5x^3=45-44=1\\ =>x^3=\dfrac{1}{5}\\ =>x=\sqrt[3]{\dfrac{1}{5}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (x-1)2-196=0
(x-1)2 =196
x-1 =\(\pm\)14
nẾU X-1= 14 \(\Rightarrow X=15\)
nẾU X-1=-14\(\Rightarrow X=-13\)
Vậy \(x\in\hept{\begin{cases}\\\end{cases}15;-13}\)
b) 2x -15=17
2x =32
2x =25
Vậy x=5
c)(7x-11)3=25.52 +200
(7x-11)3=1000
(7x-11)3 =103
7x-11 =10
7x =21
Vậy x\(\in\varnothing\)
d) x2 =x
x2 -x =0
x(x-1) =0
\(\Rightarrow\)x=0 hoặc x-1 =0
......................................
e) x3 =x
x3 -x =0
x2 (x-1)=0
\(\Rightarrow\)x2=0 hoặc x-1 =0
Nếu x2 =0 \(\Rightarrow\)x=0
........................................
a) Đề:...........
<=> x + 5 - 11 = 23 : 22
<=> x + 5 - 11 = 2
<=> x + 5 = 13
<=> x = 8
Vậy x = 8
[[x+5]-11}=2mu3:2mu2
{[x+5]-11}=2mu1
{[x+5]-11}=2
[x+5]=11+2
x+5=13
x=13-5
x=8