tìm x biết: a) 2ˣ-15=17 b) (7×x-11)=25×5²+200 c)x¹⁰=x
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a: =>2^x=32
=>x=5
b: =>7x-11=25*25+200=825
=>7x=836
=>x=836/7
c: =>x(x^9-1)=0
=>x=0 hoặc x^9-1=0
=>x=0 hoặc x=1
a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11-15-11=x-25+9
-15=x-16
x=1
b, 2 - x = 17 - ( - 5 )
2-x=22
x=-20
c, x - 12 = ( - 9 ) - 15
x-12=-24
x=-12
d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )
(7-x)-32=-16
7-x=16
x=-9
#H
a) Ta có: \(x-12=\left(-9\right)-15\)
\(\Rightarrow x-12=-24\)
\(\Rightarrow x=-12\)
b) \(2-x=17-\left(-5\right)\)
\(\Rightarrow2-x=22\)
\(\Rightarrow x=2-22\)
\(\Rightarrow x=-20\)
c) \(11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Rightarrow-15=x-16\)
\(\Rightarrow x=1\)
d) \(x-\left(17-x\right)=x-7\)
\(\Rightarrow x-17+x=x-7\)
\(\Rightarrow x+x-x=-7+17\)
\(\Rightarrow x=10\)
e) \(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Rightarrow9-25=7-x-25-7\)
\(\Rightarrow-16=-25-x\)
\(\Rightarrow x=-9\)
g) \(x-13=21-x\)
\(\Rightarrow x+x=21+13\)
\(\Rightarrow2x=34\)
\(\Rightarrow x=17\)
a, x - 12 = ( -9 ) - 15
x - 12 = -24
x = -24 + 12
x = -12
b, 2 - x = 17 - ( -5 )
2 - x = 22
x = 2 - 22
x = -20
c, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11 - 26 = x - 16
-15 = x - 16
x = -15 + 16
x = 1
d, x - ( 17 - x ) = x - 7
x - 17 + x = x - 7
x + x - 17 = x - 7
x + x - x = -7 + 17
x = 10
e.9 - 25 = ( 7- x ) - ( 25 + 7 )
-16 = ( 7 - x ) -32
7 - x = -32 + 16
7 - x = 16
x = 7 - 16
x= -9
g, x - 13 = 21 - x
x + x = 21 + 13
2x = 44
x = 44 : 2
x=22
a) -2x-17=-11 b)15-7+2x=-11+25 c) 43-x-17=-17+25
-2x=6 8+2x=14 26-x=8
x=-3 2x=6 x=18
x=3
d) -42|x|=-15 e)|x-2|+13=17 g)-11<|x|<3
|x| = + - 5/14 |x-2|=4 xl mk k biết làm câu này. bạn nào biết giải nốt giúp mk nha!
xét 2 trường hợp x>0 và x<0.
lần sau bạn có đăng bài dài như thế này thì bạn hãy chia ra làm 2 bài để m.n có hứng giải giúp bạn nha!
\(a,2-x=17-\left(-5\right)\)
\(\Rightarrow2-x=17+5\)
\(\Rightarrow2-x=22\)
\(\Rightarrow x=2-22\)
\(\Rightarrow x=-20\)
Vay...
\(b,11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Rightarrow11-26=x-16\)
\(\Rightarrow-15=x-16\)
\(\Rightarrow-15+16=x\)
\(\Rightarrow x=1\)
a)2-x=17-(-5)
2-x=17+5
2-x=22
x=2-20
x=-20
b)x-12=-9-15
x-12=-24
x=(-24)+12
x=-12
c)11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
d)x-25=(7-x)-(25+7)
x-25=(7-x)-32
2x-25=7-32
2x-25=-25
2x=(-25)+25
2x=0
x=0:2
x=0
tick cho mk nha bạn
a)2-x=17-(-5)
2-x=17+5
2-x=22
x=2-20
x=-20
b)x-12=-9-15
x-12=-24
x=(-24)+12
x=-12
c)11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
d)x-25=(7-x)-(25+7)
x-25=(7-x)-32
2x-25=7-32
2x-25=-25
2x=(-25)+25
2x=0
x=0:2
x=0
tìm số tự nhiên x biết
a)2^x-15=17
b)(7^x-11)^3=2^5.5^2+200
c)2.3^x=10.3^12+8.27^4
d)(2x-150^5=(2x-15)^3
2\(^x\)- 15 = 17
\(\Rightarrow\)2\(^x\) = 32
\(\Rightarrow\)x = 5
a) a^x-15 = 17
a^x=32
a^x=2^5
\(\Rightarrow\)x=5
Vậy x=5
b/ (7.x-11)^3 = 2^5.5^2+200
\(\Leftrightarrow\)(7.x-11)^3=800+200
\(\Leftrightarrow\)(7.x-11)^3= 1000
\(\Leftrightarrow\)(7x-11)^3= 10^3
\(\Leftrightarrow\) 7x-11=10
\(\Leftrightarrow\)7x=21
\(\Leftrightarrow\) x=3
Vậy x=3
a) ax - 15 = 17
ax = 17 + 15
ax = 32
ax = 25
=> x = 5
Vậy x = 5
b) (7 . x - 11)3 = 25 . 52 + 200
(7 . x - 11)3 = 32 . 25 + 200
(7 . x - 11)3 = 1000
(7 . x - 11)3 = 103
=> 7 . x - 11 = 10
7 . x = 10 + 11
7 . x = 21
x = 21 : 7
x = 3
Vậy x = 3
Ủng hộ mk nha !!! *_*
a) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5\)
\(\Rightarrow x=10\)
b) \(15-\left(3+2x\right)=2^2\)
\(\Rightarrow3+2x=15-4\)
\(\Rightarrow3+2x=11\)
\(\Rightarrow2x=11-3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=\dfrac{8}{2}\)
\(\Rightarrow x=4\)
c) \(-11-\left(19-x\right)=50\)
\(\Rightarrow19-x=-11-50\)
\(\Rightarrow19-x=-61\)
\(\Rightarrow x=61+19\)
\(\Rightarrow x=80\)
d) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
e) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=52-17\)
\(\Rightarrow79-x-43=35\)
\(\Rightarrow36-x=35\)
\(\Rightarrow x=1\)
f) \(\left(7+x\right)-\left(21-13\right)=32\)
\(\Rightarrow7+x-8=32\)
\(\Rightarrow x-1=32\)
\(\Rightarrow x=32+1\)
\(\Rightarrow x=33\)
g) \(-x+20=-15+8+13\)
\(\Rightarrow-x+20=6\)
\(\Rightarrow x=20-6\)
\(\Rightarrow x=14\)
h) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow x-13+142+18=55\)
\(\Rightarrow x+147=55\)
\(\Rightarrow x=55-147\)
\(\Rightarrow x=-92\)
a) \(2^x-15=17\)
\(2^x=17+15=32=2^5\)
\(\Rightarrow x=5\)
b) \(\left(7x-11\right)=25.5^2+200\)
\(7x=825+11=836\)
\(x=\dfrac{836}{7}\)