86:[2.(2x-1)2-7]+42=2.32
Số nguyên x thỏa mãn: 86: [2. 5 𝑥−1 – 7] + 42 = 2.32
giúp mình với ạ
Lời giải:
$86:(2.5x-1-7)+42=2.32=64$
$86:(10x-8)+42=64$
$86:(10x-8)=64-42=22$
$10x-8=86:22=\frac{43}{11}$
$10x=\frac{43}{11}+8=\frac{131}{11}$
$x=\frac{131}{11}:10=\frac{131}{110}$
86: [2. (2x - 1)2 – 7] + 42 = 2.32
Tìm x ϵ Z:
a) 86 : [2. (2x + 1)2 - 7] + 42 = 2 . 32
b) 20 - [42 + (x - 6)] = 90
c) 1000 : [30 + (2x - 6)] = 32 + 42
d) (x + 11) ⋮ (x + 2) , x ϵ N
Giúp mk với !!
42 -(2x +32) +12 :2 =6
134 - 2 . {156 - 6.[54 -2.(9+6) ] } x=86
42 -(2x + 32) + 12 :2 =6
42 - 2x - 32 + 6 = 6
42 - 2x - 32 = 0
42 - 2x = 32
2x = 42 - 32 = 10
x = 5
134 - 2 . {156 - 6.[54 -2.(9+6) ] } x = 86
134 - 2.{ 156 - 6.[54 - 2 . 15 ]} x = 86
134 - 2.{ 156 - 6 . 24} x = 86
134 - 2. 12 .x = 86
134 - 24x = 86
24x = 48
x = 2
\(42-\left(2x+32\right)+12:2=6\)
\(\Rightarrow42-2x-32=0\)
\(\Rightarrow2x=10\)
\(\Rightarrow x=5\)
86 : [2 . (2x - 1) ^2 -7 ] + 4^2 = 2 . 3^2
Có phải ý bạn là thế này:
86 : [ 2 . (2x - 1)2 - 7 ] + 42 = 2 . 32
86 : [ 2 . (2x - 1)2 - 7 ] + 16 = 2 . 9
86 : [ 2 . (2x - 1)2 - 7 ] + 16 = 18
86 : [ 2 . (2x - 1)2 - 7 ] = 18 - 16
86 : [ 2 . (2x - 1)2 - 7 ] = 2
2 . (2x - 1)2 - 7 = 86 : 2
2 . (2x - 1)2 - 7 = 43
2 . (2x - 1)2 = 43 + 7
2 . (2x - 1)2 = 50
(2x - 1)2 = 50 : 2
(2x - 1)2 = 25
(2x - 1)2 = 52
2x - 1 = 5
2x = 5 + 1
2x = 6
x = 6 : 2
x = 3
Chúc bạn học tốt!
86 : [2 . (2x - 1) ^2 -7 ] + 4^2 = 2 . 3^2
\(86:\left[2\left(2x-1\right)^2-7\right]+4^2=2.3^2\)
\(\Rightarrow86:\left[2\left(2x-1\right)^2-7\right]=18-16=2\)
\(2\left(2x-1\right)^2-7=86:2=43\)
\(\Rightarrow\left(2x-1\right)^2=25\)
\(\Rightarrow\orbr{\begin{cases}2x-1=5\Leftrightarrow x=3\\2x-1=-5\Leftrightarrow x=-2\end{cases}}\)
a) 124-2x{156-6x[54-2x(9+6)]} x X=86
b) 42-(2x + 32)+ 12:2=6
Giúp mk nha rùi mk tịck cho!
Cậu dùng máy tính dùng shift solve là đc
Kết quả
a, 19/12
b, 5
86:[2.(2x-1)2-7]+42=2.32
mình là hs lớp 5
sorry bạn nha
sorry!!!!!!!!!!!!!!!!!!!!!!
86:[2.(2x-1)2-7]+42=2.32
86 : [2 . (2x - 1)2 - 7] +42=2.32
86 : [2.(2x-1)2-7] + 16 = 2.9
86 : [2.(2x-1)2-7] +16 = 18
86 : [2.(2x-1)2-7]=18-16
86 : [2.(2x-1)2-7]=2
2.(2x-1)2-7=86:2
2.(2x-1)2-7=43
2.(2x-1)2=43+7
2.(2x-1)2=50
(2x-1)2=50:2
(2x-1)2=25
(2x-1)2=52
=>2x-1=5
2x=5+1
2x=6
x=6:2
x=3