Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
14 + (273 - 7x) . 2 = 518
(273 - 7x) . 2 = 504
273 - 7x = 252
7x = 21
x = 3
Vậy...........
36 x 12 + 36 x 45 + 36 x 33
= 36 x (12 + 45 + 33)
= 36 x 90
= 3240
b) 78 x 31 + 78 x 24 + 78 x 17 + 22 x 72
=78 x (31 + 24 + 17) + 22 x 72
= 78 x 72 + 22 x 72
= (78 + 22) x 72
= 100 x 72
= 7200
c) ( 34 - 17 )2 - 23 x 32
\(=17^2-8.9\)
\(=289-72\)
\(=217\)
a) X - 36 x 18 = 12
X - 36 = 12 : 18
X - 36 = 2/3
X = 2/3 + 36
X = \(36\frac{2}{3}\)
b) ( X - 36 ) : 18 = 12
X - 36 = 12 x 18
X - 38 = 216
X = 216 + 38
X = 254
1) x - 36 + 12 = - x+ 10
=> x + x = 10 + 24
=> 2x = 34
=> x = 34/2 = 17
2) (x + 15) - (11 - x) = (-2)2
=> x + 15 - 11 + x = 4
=> 2x = 4 - 4
=> 2x = 0
=> x = 0
3) 40 - 4x2 = (-6)2
=> 40 - 4x2 = 36
=> 4x2 = 40 - 36
=> 4x2 = 4
=> x2 = 1
=> x = \(\pm\)1
4) (-50) + 10x2 = (-25) x |-2|
=> -50 + 10x2 = -50
=> 10x2 = -50 + 50
=> 10x2 = 0
=> x2 = 0
=> x = 0
5) |x + 1| = 2020
=> \(\orbr{\begin{cases}x+1=2020\\x+1=-2020\end{cases}}\)
=> \(\orbr{\begin{cases}x=2019\\x=-2021\end{cases}}\)
6) (x + 1)5 + 8 = 0 (xem lại đề)
7) (-20) + x3 : 16 = -24
=> x3 : 16 = -24 + 20
=> x3 : 16 = -4
=> x3 = -4 . 16
=> x3 = -64 = (-4)3
=> x = -4
9) x14 = x17
=> x14 - x17 = 0
=> x14(1 - x3) = 0
=> \(\orbr{\begin{cases}x^{14}=0\\1-x^3=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
10) (-36) + (1 - x)2 = 0
=> (1 - x)2 = 36
=> (1 - x)2 = 62
=> \(\orbr{\begin{cases}1-x=6\\1-x=-6\end{cases}}\)
=> \(\orbr{\begin{cases}x=-5\\x=7\end{cases}}\)
a , 60 + { 75 - [ 30 + ( 5 - 3 ) 2 ] }
= 60 + { 75 - [ 30 + 22 ] }
= 60 + [ 75 - 30 - 4 }
= 60 + 75 - 30 - 4
= 135 - 30 - 4
= 105 - 4 = 101
b , 3 . 22 + 54 : 20
= 3 . 4 + 54 : 1
= 12 + 54
= 12 + 3125 = 3137
Bài 2 |:
a , x - 24 : 12 = 15
x - 24 = 15 . 12
x - 24 = 180
x = 180 + 24
x = 204
c , 2( x + 1 ) - 15 = 35
2( x + 1 ) = 50
x + 1 = 50 : 2
x + 1 = 25
x = 24
d , 36 + 4x = 56
4x = 20
=> x = 5
1)
a) 101
b) 637
2)
a) x - 24 : 12 = 15
=> x - 2 = 15
=> x = 17
b) thiếu đề
c) 2 ( x + 1 ) - 15 = 35
=> 2x + 2 = 50
=> 2x = 48
=> x = 24
d) 36 + 4x = 56
=> 4x = 20
=> x = 5
\(\left[x-36\right]:18=12\)
\(x-36=12.18\)
\(x-36=216\)
\(x=216+36\)
\(x=252\)
\(\left[2x+1\right]^3=125\)
\(\left[2x+1\right]^3=5^3\)
=> \(2x+1=5\)
\(2x=5-1\)
\(2x=4\)
\(x=4:2=2\)
\(2^x.4=128\)
\(2^x=32\)
\(2^x=2^5\)
=> \(x=5\)
\(x^{50}=x\)
\(x=1\)
hoặc
\(x=0\)
a) Ta có: \(\left[\frac{\left(8x-12\right)}{4}\right]\cdot3^3=3^6\)
\(\Leftrightarrow\frac{8x-12}{4}=3^3\)
\(\Leftrightarrow2x-3=3^3\)
\(\Leftrightarrow2x-3=27\)
\(\Leftrightarrow2x=30\)
hay x=15
Vậy: x=15
b) Ta có: \(3^{2+1}+3^x=36\)
\(\Leftrightarrow3^3+3^x=36\)
\(\Leftrightarrow3^x=9\)
hay x=2
Vậy: x=2
c) Ta có: \(2^{x+1}=16\)
\(\Leftrightarrow2^{x+1}=2^4\)
\(\Leftrightarrow x+1=4\)
hay x=3
Vậy: x=3
1.a)
[(8x - 12) : 4] . 33 = 36
(8x - 12) : 4 = 36 : 33 = 33 = 27
8x - 12 = 27 . 4 = 108
8x = 108 + 12 = 120
x = 120 : 8 = 15
b)
32+1 + 3x = 36
27 + 3x = 36
3x = 36 - 27 = 9 = 32
=> x = 2
122 +(518-x)= -36
144 +( 518- x) = -36
518 - x =(-36) - 144
518 - x= -180
x=518 - (-180)
x=698