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( 7x - 11 )3 = 25 . 52 + 200
\(\Rightarrow\)( 7x - 11 )3 = 32 . 25 + 200
\(\Rightarrow\)( 7x - 11 )3 = 800 + 200
\(\Rightarrow\)( 7x - 11 )3 = 1000
\(\Rightarrow\)( 7x - 11 )3 = 103
\(\Rightarrow\)7x - 11 = 10
\(\Rightarrow\)7x = 10 + 11 = 21
\(\Rightarrow\)x = 21 : 7
\(\Rightarrow\)x = 3
( 7x - 11 )3 = 25 . 52 + 200
( 7x - 11 )3 = 32 . 25 + 200
( 7x - 11 )3 = 800 + 200
( 7x - 11 )3 = 1000
( 7x - 11 )3 = 103
7x - 11 = 10
7x = 10 + 11
7x = 21
x = 21 : 7
x = 3
\(\left(7x-11\right)^3=2^5.5^2+200.\)
\(\left(7x-11\right)^3=800+200\)
\(\left(7x-11\right)^3=1000\)
\(\left(7x-11\right)^3=10^3\)
\(\Leftrightarrow7x-11=10\)
\(\Leftrightarrow7x=10+11\)
\(\Leftrightarrow7x=21\)
\(\Leftrightarrow x=3\)
Vậy ...........
(7x -11)3 - 200 = 25. 52
(7x - 11)3 - 200 = 32 . 25
(7x - 11)3 - 200 = 800
(7x - 11)3 = 800 + 200
(7x - 11)3 = 1000
(7x -11)3 = 103
7x - 11 = 10
7x = 10 + 11
7x = 21
x = 21: 7
x = 3
Vậy x=3
(7x-11)3=25.22+200
(7x-11)3=25+2+200
(7x-11)3=27+200
(7x-11)3=128+200
(7x-11)3=328
xong hết bt
(7x - 11)3 = 25.52 + 200
=> (7x - 11)3 = 800 + 200
=> (7x - 11)3 = 1000
=> (7x - 11)3 = 103
=> 7x - 11 = 10
=> 7x = 10 + 11
=> 7x = 21
=> x = 21 : 7 = 3
3x + 25 = 26.22 + 2.30
=> 3x + 25 = 104 + 2
=> 3x + 25 = 106
=> 3x = 106 - 25
=> 3x = 81
=> 3x = 34
=> x = 4
a)\(\left(7x-11\right)^3=2^5.5^2+200\) b) \(3^x+25=26.2^2+2.3^0\)
\(\left(7x-11\right)^3=32.25+200\) \(3^x+25=26.4+2.1\)
\(\left(7x-11\right)^3=800+200\) \(3^x+25=104+2\)
\(\left(7x-11\right)^3=1000\) \(3^x+25=106\)
\(\Rightarrow\left(7x-11\right)^3=10^3\) \(3^x=106-25\)
\(\Rightarrow7x-11=10\) \(3^x=81\)
\(7x=10+11\) \(3^x=3^4\)
\(x=\frac{21}{7}\) \(\Rightarrow x=4\)
\(x=3\) Vậy x = 4
Vậy x = 3
a, => 2x=2
=> x=1
b, => (7x-11)3=1000
=> 7x-11=10
=> 7x=21
=> x=3
Toán lớp 6Lũy thừa
2^x-15=17
<=> 2^x=17+15=32
<=> 2^x=2^5
<=> x=5
(7x-11)^3= 2^5.5^2+200
<=> (7x-11)^3=1000
<=> (7x-11)^3=10^3
<=> 7x-11=10
<=> 7x=10+11=21
<=> x=21:7=3
(7x-11)3 = 23 x 52 +200
(7x-11)3 = 8 x 25 +200
(7x-11)3 = 200 +200
(7x-11)3 = 400
(7x-11)3 = đề sai
(7x-11)3 = 23 x 52 +200
(7x-11)3 = 8 x 25 +200
(7x-11)3 = 200 +200
(7x-11)3 = 400
(7x-11)3 = đề sai
=> không tính được