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a) 30 ( 22.15 +x ) =30
22 . 15 + x = 30 :30
22.15 +x = 1
4 . 15 +x =1
60 +x = 1
x = 1 - 60
x = -59
b) 24 . 38 -24 . x = 16
16 . 38 - 16.x = 16
608 - 16 .x = 16
16.x = 608 -16
16.x =592
x = 592 :16
x =37
c)(7x -11)3=25 .52 +200
( 7x - 11)3=1000
(7x-11)3 = 1000
( 7x - 11)3=103
7x-11=10
7x = 10+11
7x = 21
x = 21:7
x=3
d) 3x-43 = 17
3x - 64 =17
3x=17+64
3x=81 = 34
=> x = 4
**** cho mình nhá!!!
\(\frac{1024}{\left(17x2^5+15x2^5\right)}=\frac{2^{10}}{32x2^5}=\frac{2^{10}}{2^5.2^5}=\frac{2^{10}}{2^{10}}=1\) (1024=210; 32=25)
chị giúp nhưng phải k cho c nhé.
\(1024:\left(17x2^5+15x2^5\right)\)
\(=\)\(1024:\left[\left(17+15\right)x2^5\right]\)
\(=1024:\left(32x2^5\right)\)
\(=2^{10}:\left(2^5x2^5\right)\)
\(=2^{10}:2^{10}=1\)
a, 5 . ( x - 6 ) - 415 = 15
5 . ( x -6 ) = 15 + 415
5 . ( x - 6 ) = 430
x-6 = 430 : 5
x - 6 = 86
x = 86 + 6
x = 92
b, ( 3 . x - 12 ) . 3 = \(3^3\)
3 . x - 12 = 27 : 3
3 . x - 12 = 9
3. x = 9 + 12
3 . x = 21
x = 21 : 3
x = 7
x, \(\left(5-x\right)^2\) . \(2^2\) = 64
\(\left(5-x\right)^2\) . 4 = 64
\(\left(5-x\right)^2\) = 64 : 4
\(\left(5-x\right)^2\) = 16
\(\left(5-x\right)^2\) = \(4^2\)
5 - x = 4
x = 5 -4
x =1
Tk mk nha
\(\left(7x-11\right)^3=2^5\times5^2+200\)
\(\left(7x-11\right)^3=32\times25+200\)
\(\left(7x-11\right)^3=800+200\)
\(\left(7x-11\right)^3=1000\)
\(\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(7x=10+11\)
\(7x=21\)
\(x=21\div7\)
\(x=3\)
(7x-11)^3=2^5x5^2+200
(7x-11)^3=32x25+200
(7x-11)^3=800+200
(7x-11)^3=1000
(7x-11)^3=10^3
=>7x-11=10
7x=10+11
7x=21
x=21:7
x=3
Bài này nhiều người hỏi rồi nha
(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
vậy x = 3
k mình nha
(7x - 11)3=25.52+200
(7x - 11)3=32 x 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
Vậy 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
Vậy x = 3
(7x - 11)3 = 25.52 + 200
(7x - 11)3 = 1000
(7x - 11)3 = 103
7x - 11= 10
7x = 21
x = 3
Vậy 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
\(\Rightarrow\) 7x - 11 = 10
\(\Rightarrow\) 7x = 21
\(\Rightarrow\) x = 3
Vậy x = 3
\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Leftrightarrow\left(7x-11\right)^3=32.25+200\)
\(\left(7x-11\right)^3=800+200\)
\(\Leftrightarrow\left(7x-11\right)^3=1000\)
\(\Leftrightarrow\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(\Leftrightarrow7x=10+11=21\)
\(\Leftrightarrow x=21:7\)
\(\Rightarrow x=3\)
Vậy: x=3