Tìm x
a)131.x-941=32
b)88-(7+x).3=64
c)51+(26-3x):5=55
Tìm X biết
a)22.x-5=32
b)42x-1=64
c)(2.X+2)2=121
d)2x3-1=255
mn ơi giúp mik với mik cần gấp
\(a,\Rightarrow2^{2x-5}=2^5\Rightarrow2x-5=5\Rightarrow x=5\\ b,\Rightarrow4^{2x-1}=4^3\Rightarrow2x-1=3\Rightarrow x=2\\ c,\Rightarrow\left[{}\begin{matrix}2x+2=11\\2x+2=-11\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{9}{2}\\x=-\dfrac{13}{2}\end{matrix}\right.\\ d,\Rightarrow2^{x^3}=256=2^8\Rightarrow x^3=8\Rightarrow x=2\)
a)
\(2^{2x-5}=2^5\)
2x-5=5
2x=10
x=5
b)
\(4^{2x-1}=4^3\)
2x-1=3
2x=4
x=2
c)
\(\left(2x+2\right)^2=11^2\)
2x+2=11
2x=9
x=9/2
a) \(2^{2x-5}=32\)
⇒\(2^{2x-5}=2^5\)
⇒\(2x-5=5\)
⇒\(2x=10\)
⇒\(x=5\)
Tìm X :
1) ( 2016 + X ) : 169 = X
2) 51 + ( 26 - 3X ) : 5 = 55
3) [ ( X + 32 ) - 17 ] . 2 = 42
1) 2016 +x = 169x
<=> 2016 = 168x
<=> x=12
2) (26 - 3x) : 5= 4
<=> 26 - 3x = 20
<=> 3x =6
<=> x=2
3) x + 32 - 17 = 21
<=> x + 15 = 21
<=> x= 6
88-3x(7+x )=64
131x x- 941=128x8
27x332+68x27+73x332+68x75=332x(27+73)+68x(27+75)
= 332x100+68x102
= 33200+6936=10136
1) Tìm x:
a) 88 - 3 ( 7 + x ) = 64 b) 131 . x - 941 = 27. 23
c) [ ( x + 32 ) - 17 ] : 2 = 42 d) [ ( x2 + 54 ) - 32 ] : 2 = 61
\(a)88-3(7+x)=64\) \(c)[(x+32)-17]\div2=42\)
\(\Rightarrow3(7+x)=88-64\) \(\Rightarrow(x+32)-17=42.2\)\(\Rightarrow x+32-17=84\)
\(\Rightarrow3(7+x)=24\) \(\Rightarrow x=84+17-32\)
\(\Rightarrow7+x=24\div3\) \(\Rightarrow x=69\)
\(\Rightarrow7+x=8\)
\(\Rightarrow x=8-7\)
\(\Rightarrow x=1\)
\(b)131.x-941=2^7.2^3\) \(d)[(x^2+54)-32]\div2=61\)
\(\Rightarrow131.x-941=2^{10}\) \(\Rightarrow(x^2+54)-32=61.2\)
\(\Rightarrow131.x=1024+941\) \(\Rightarrow x+54-32=122\)
\(\Rightarrow131.x=1965\) \(\Rightarrow x=122+32-54\)
\(\Rightarrow x=1965\div131\) \(\Rightarrow x=100\)
\(\Rightarrow x=15\)
A) 88-3(7+x)=64
3(7+x)=88-64
3(7+x)=24
7+x=24:3
7+x=8
X=8-7
X=1
[(x+32)-17]:2=42
(X+32)-17=42*2
(X+32)-17=84
X+32=84+17
X+32=101
X =101-32
X=69
Tìm x
491-(x + 83) = 336
(517-x) + 131 =631
88 - 3(7 +x) = 631
(7x - 15) : 3 =2
(x-1)(2x -6)=0
(2 - x) (3x -21) (x-5) = 0
Tìm x
a) 3x – 30 = 35 : 32
b) 120 – 4 . ( 9 + x ) = 16
\(a,3x-30=3^5:3^2\\ \Rightarrow3x-30=3^3\\ \Rightarrow3x-30=27\\ \Rightarrow3x=57\\ \Rightarrow x=19\\ b,120-4\left(9+x\right)=16\\ \Rightarrow4\left(9+x\right)=104\\ \Rightarrow9+x=26\\ \Rightarrow x=17\)
Tìm số tự nhiên x, biết:
a) (x- 29) - 11 = 0;
b) 231 + (312 - x) = 531
c) (4 . x + 5) : 3 - 121 : 11 = 4
d) 131. x - 941 = 27 . 23
a) x = 40.
b) x = 12.
c) x = 10.
d) x = 15.
131 nhân x - 941 = 2 mũ 7 nhân 2 mũ 3
vì 2^7x2^3=1024
xuy ra 1024-941:131
vậy x=15
\(131\cdot x-941=2^7\cdot2^3\)
131 . x - 941 = 27 . 23
131 . x - 941 = 27+3
131 . x - 941 = 210
131 . x - 941 = 1024
131 . x = 1024 + 941
131 . x = 1965
x = 1965 : 131
x = 15
Vậy x = 15
nhéthien binh cong chua
k mình nhé bạn mình trả lời đầu tiên !
\(\Rightarrow131.x-941=1024\)
\(\Rightarrow131x=1965\)
\(\Rightarrow x=15\)
131 . x - 941 = 2^7 . 2^3
131 . x - 941 = 2^10
131 . x - 941 = 1024
131 . x = 1024 + 941
131 . x = 1965
x = 1965 : 131
x = 15