tìm x biết\(\left(7x-11\right)^3=2^5.5^2+200\)
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Tìm \(x\)
\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Leftrightarrow\left(7x-11\right)^3=1000\)
\(\Leftrightarrow7x-11=10\)
\(\Leftrightarrow7x=21\)
\(\Leftrightarrow x=3\)
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\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Rightarrow\left(7x-11\right)^3=32.25+200\)
\(\Rightarrow\left(7x-11\right)^3=800+200\)
\(\Rightarrow\left(7x-11\right)^3=1000=10^3\)
\(\Rightarrow7x-11=10\)
\(\Rightarrow7x=21\)
\(\Rightarrow x=3\)
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\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Rightarrow\left(7x-11\right)^3=32.25+200\)
\(\Rightarrow\left(7x-11\right)^3=800+200\)
\(\Rightarrow\left(7x-11\right)^3=1000=10^3\)
\(\Rightarrow7x-11=10\)
\(\Rightarrow7x=21\)
\(\Rightarrow x=3\)
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PT
27 tháng 8 2021 lúc 15:25
tìm x thuộc n:
\(\left(7x-11\right)^3=2^5.5^2+200\)
giúp mik nha mik cần gấp
(7x−11)3 = 25 . 52 + 200
(7x−11)3 = 32 . 25 + 200
(7x−11)3 = 1000
(7x−11)3 = 103
7x−11 = 10
7x = 10 + 11
7x = 21
x = 21 : 7
x = 3
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(7x−11)3 = 25 . 52 + 200
(7x−11)3 = 32 . 25 + 200
(7x−11)3 = 1000
(7x−11)3 = 103
7x−11 = 10
7x = 10 + 11
7x = 21
x = 21 : 7
x = 3
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Tìm x biết: (7x-11)^3=2^5.5^2+200
Ta có: \(\left(7x-11\right)^3=2^5+5^2+200=1000\)
\(\Rightarrow\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(\Rightarrow7x=21\)
\(\Rightarrow x=3\)
Trả lời:
\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Leftrightarrow\left(7x-11\right)^3=32.25+200\)
\(\Leftrightarrow\left(7x-11\right)^3=800+200\)
\(\Leftrightarrow\left(7x-11\right)^3=1000\)
\(\Leftrightarrow7x-11=10\)
\(\Leftrightarrow7x=21\)
\(\Leftrightarrow x=3\)
Vậy\(x=3\)
Hok tốt!
Good girl
\(\left(7\text{x}-11\right)^3=2^5\text{ }.\text{ }5^2+200.\)
\(\left(7\text{x}-11\right)^3=32\text{ }.\text{ }25+200.\)
\(\left(7\text{x}-11\right)^3=800+200.\)
\(\left(7\text{x}-11\right)^3=1000.\)
\(\left(7\text{x}-11\right)^3=10^3.\)
\(\Rightarrow\text{ }\text{7x}-11=10.\)
\(\text{7x}=10+11\)
\(\text{7x}=21\)
\(x=21\div7\)
\(x=3\)
Vậy \(x=3\)
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Tìm x thuộc N
a) \(2^x-64=2^6\)
b)\(\left(7x-11\right)^3=2^5.5^2+200\)
a) \(2^x\)\(-\)\(64\)\(=\)\(2^6\)
\(2^x\)\(-\)\(2^6\)\(=\)\(2^6\)
\(2^x\) \(=\)\(2^6\)\(+\)\(2^6\)
\(2^x\) \(=\) \(64\)\(+\)\(64\)
\(2^x\) \(=\) \(128\)
\(\Rightarrow\) \(2^x\) \(=\) \(2^7\)
b) \(\left(7x-11\right)\)\(^3\)\(=\)\(2^5\)\(.\)\(5^2\)\(+\)\(200\)
\(\left(7x-11\right)\)\(^3\)\(=\)\(32\)\(.\)\(25\)\(+\)\(200\)
\(\left(7x-11\right)\)\(^3\)\(=\) \(1000\)
\(\left(7x-11\right)\)\(^3\)\(=\) \(10^3\)
\(\Rightarrow\)\(7x-11\)\(=\)\(10\)
\(7x\) \(=\)\(10+11\)
\(7x\) \(=\) \(21\)
\(x\) \(=\) \(21\)\(:\)\(7\)
\(x\) \(=\) \(3\)
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\(2^x-64=2^6\)
\(2^x-64=64\)
\(2^x=64+64\)
\(2^x=128\)
\(\)Vì \(128=2^7\) \(\Rightarrow x=7\)
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a, 2x-64=26
=> 2x-64=64
=> 2x=64-64
=> 2x=0
=> x=0
b, (7x-11)3=25.52+200
=> (7x-11)3=32.25+200
=> (7x-11)3=1000
=> (7x-11)3=103
=> 7x-11=10
=> 7x=10+11
=> 7x=21
=> x=21:7
=> x=3
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tim x biet
\(\left(7x-11\right)^3=2^5.5^2+200\)
minh can cach lam gappppppp ai nhanh minh tk luon
\(\left(7x-11\right)^3=2^5.5^2+200\)
=> \(\left(7x-11\right)^3=32.25+200\)
=>\(\left(7x-11\right)^3=800+200\)
=>\(\left(7x-11\right)^3=1000\)
=>\(\left(7x-11\right)^3=10^3\)
=> \(7x-11=10\)
=>\(7x=21\)
=>\(x=3\)
Vậy x = 3
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\(\left(7x-11\right)^3=2^5\cdot5^2+200\)
\(\left(7x-11\right)^3=800+200\)
\(\left(7x-11\right)^3=1000\)
\(\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(7x=10+11\)
\(7x=21\)
\(x=21\div7\)
\(x=3\)
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\(\left(7x-11\right)^3=2^5\cdot5^2+200\)
\(\left(7x-11\right)^3=32\cdot25+200\)
\(\left(7x-11\right)^3=1000\)
\(\left(7x-11\right)^3=10^3\)
\(7x-11=10\)
\(7x=21\)
\(x=3\)
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Tìm x biết (7x-11)^3=2^5.5^2+200
\(\Leftrightarrow\left(7x-11\right)^3=32\cdot25+200=1000\)
=>7x-11=10
=>x=3
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1. Tìm x,biết:
a) \(2^x\)- 15 = 17
b) \(\left(7x-11\right)^3\)= \(2^5.5^2+200\)
c) \(^{x^{10}=1^x}\)
d) \(x^{10}=x\)
e) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)
2. Tính:
\(A=\frac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right)^2}\)
a) 2x-15= 17
2x = 17-15
2x = 2
2x = 21
x = 1
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Tìm n thuộc N biết:
\(\left(7n-11\right)^3=2^5.5^2+200\)
\(\Rightarrow\left(7n-11\right)^3=32\times25+200\)
\(\Rightarrow\left(7n-11\right)^3=1000\)
\(\Rightarrow7n-11=10\)
\(\Rightarrow7n=10+11\)
\(\Rightarrow n=21:7=3\)
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\(\left(7n-11\right)^3=2^5.5^2+200\)
\(\left(7n-11\right)^3=32.25+200\)
\(\left(7n-11\right)^3=800+200\)
\(\left(7n-11\right)^3=1000\)
=>TH1:(7n-11)3=103
=>7n-11=10
=>7n=10+11=21
=>n=21:7=3
TH2: (7n-11)3=-103
=>7n-11=-10
=>7n=-10+11
=>7n=1
=>n=1:7=1/7
Mà n thuộc N nên n=3
Kết luận n=3
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Trà My~ Cần j lm 2 TH; you lm sai roay đs. Vì nếu (7n-11)3=-10 thì lm sao -103=1000 cho được
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Tìm x biết \(\left(7x-11\right)^3=2^5\times2^2+200\)