Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
mk vừa làm hoi này cho bạn mà
C=[(46-32)^2-(54-42)^2]*36-1872
=(14^2-12^2)*36-1872
=(196-144).36-1872
=52.36-1872
=1872-1872
=0
[(46-32)^2-(54-42)^2]*36-1872
=(14^2-12^2)*36-1872
=(196-144).36-1872
=52.36-1872
=1872-1872
=0
(x-7)^7=(x-7)^8
=>(x-7)^7-(x-7)^8=0
=>(x-7)^7.1-(x-7)^7.(x-7)=0
=>(x-7)^7.[1-(x-7)]=0
\(\Rightarrow\orbr{\begin{cases}x-7=0\\1-\left(x-7\right)=0\end{cases}\Rightarrow\orbr{\begin{cases}x=7;-7\\x=0\end{cases}}}\)
Vậy x={7;-7;0}
1+2^3+3^3-4^2.x=20
=>36-4^2.x=20
=>4^2.x=16=4^2
=>2.x=2
=>x=1
\(\left[\left(46-32\right)^2-\left(54-42\right)^2\right]\times36-1872\)
\(=\left(14^2-12^2\right)\times36-1872\)
\(=\left(196-144\right)\times36-1872\)
\(=52\times36-1872\)
\(=1872-1872\)
\(=0\)
\(\left[\left(46-32\right)^2-\left(54-42\right)^2\right]\cdot36-1872\)
\(=\left[\left(14\right)^2-12^2\right]\cdot36-1872\)
\(=\left(196-144\right)\cdot36-1872\)
\(=52\cdot36-1872\)
\(=1872-1872\)
\(=0\)
bài 1
a)
=> 3(x-2)=60-51
=> 3(x-2) =9
=> x-2 =9:3
=> x-2 =3
=> x =3+2
=> x =5
b)
=>4x-20=25-2
=>4x-20=23
=>4x-20=8
=>4x=8+20
=>4x=28
=>x=28:4
=>x=7
c)
=> 25+x.5-64=251
=> x.5-64 =251-25
=> x.5-64 =226
=> x.5 =226+64
=> x.5 =290
=> x =290:5
=> x =58
d)
=> [(14)2 - (12)2].2x=1872
=> 52.2x =1872
=> 104x =1872
=> x = 1872:104
=> x=18
e)
x10=x
=> x10-x=0
=>x(x9-1)=0
=>\(\orbr{\begin{cases}x=0\\x^9-1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x^9=1\Rightarrow x=1\end{cases}}}\)
nha
mình sẽ làm típ
T I C K cho mình mình sẽ làm típ
a, \(\left(7.4^x+8.4^{x+1}\right).5=3120\)
\(7.4^x+8.4^x.4=3120:5\)
\(4^x\left(7+32\right)=624\)
\(4^x=624:39\)
\(4^x=16=4^2\)
\(\Rightarrow x=2\)
b, \(2018^2.2018^x=2018^6\)
\(2018^x=2018^6:2018^2=2018^4\)
\(\Rightarrow x=4\)
c, \(3^{x-2}-19=62\)
\(3^x:3^2=62+19\)
\(3^x=81.9=729=3^6\)
\(\Rightarrow x=6\)
d, \(5^{x+2}-5^{x+1}=2500\)
\(5^x\left(25-5\right)=2500\)
\(5^x=2500:20=125=5^3\)
\(\Rightarrow x=3\)
e, \(\left[\left(46-32\right)^2-\left(54-42\right)^2\right].2x-1872=0\)
\(\left[14^2-12^2\right].2x=1872\)
\(\left[196-144\right].2x=1872\)
\(52.2x=1872\)
\(2x=1872:52=36\)
\(\Rightarrow x=36:2=18\)
:)))
HỌC TỐT !
a) ( 7. 4x + 8 . 4x+1 ) . 5 = 3120
=> 7 . 4x + 8 . 4x . 41 = 624
=> 4x ( 7 + 8 . 4 ) = 624
=> 4x . 39 = 624
=> 4x = 16
=> 4x = 42
=> x = 2
b) 20182 . 2018x = 20186
=> 2018x = 20184
=> x = 4
c) 3x-2 - 19 = 62
=> 3x-2 = 81
=> 3x-2 = 34
=> x - 2 = 4
=> x = 6
d) 5x+2 - 5x+1 = 2500
=> 5x . 52 - 5x . 5 = 2500
=> 5x ( 52 - 5 ) = 2500
=> 5x . 20 = 2500
=> 5x = 125
=> 5x = 53
=> x = 3
e) [ ( 46 - 32 )2 - ( 54 - 42 )2 ] . 2x - 1872 = 0
=> [ 142 - 122 ] . 2x = 1872
=> [ 196 - 144 ] . 2x = 1872
=> 52 . 2x = 1872
=> 2x = 36
=> x = 18
C=[(46-32)^2-(54-42)^2]*36-1872
=(14^2-12^2)*36-1872
=(196-144).36-1872
=52.36-1872
=1872-1872
=0