Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, - 2 .( x + 6 ) + 6 . ( x - 10 ) = 8
- 2x - 12 + 6x - 60 = 8
4x - 72 = 8
4x = 8 + 72
4x = 80
x = 20
b, - 4 . ( 2x + 9 ) - ( - 8x + 3 ) - ( x + 13 ) = 0
- 8x - 36 + 8x - 3 - x - 13 = 0
- x - 52 = 0
x = - 52
c, 7x . ( 2 + x ) - 7x . ( x + 3 ) = 14
7x . ( 2 + x - x - 3 ) = 14
7x . ( - 1 ) = 14
7x = 14 : ( - 1 )
7x = - 14
x = - 2
d, 2 . ( 5 + 3x ) + x = 31
10 + 6x + x = 31
10 + 7x = 31
7x = 31 - 10
7x = 21
x = 3
a)-2(x+6)+6(x-10)=8
-2x+-12+6x+-60=8
4x+-72=8
4x=80
x=80:4
x=20
b)-4(2x+9)-(-8x+3)-(x+13)=0
-8x+-36+8x-3+x-13=0
(-8x+8x)+-36+-3+x-13=0
0+-52+x=0
x=0-(-52)
x=-52
c)7x(2+x)-7x(x+3)=14
14x+7x2
Ta co´:
-4 ( 2x + 9 ) - ( -8x + 3 ) - ( x + 13 ) = 0
-8x - 36 + 8x -3 - x - 13 = 0
. ( -8x + 8x ) - 36 - 3 - x - 13 = 0
- 36 - 3 - x - 13 = 0
x = 0 + 36 + 3 + 13
x = 52
a) -4.(2x+9)-(-8x+3)-(x+13)=0
-8-36+8x-3-x-13=0
-x-52=0
x=-52
b) 7x.(2+x)-7x.(x+3)=14
7x.(2+x-x-3)=14
7x.(-1)=14
7x=14:(-1)
7x=-14
x=(-14):7
x=-2
a) -2. (x+ 6) + 6. (x - 10) =8
<=> -2x - 12 + 6x - 60 = 8
<=> 4x = 36
<=> x = 9
b) -4. (2x + 9) - (-8x + 3) - (x + 13) = 0
<=> -8x - 36 + 8x - 3 - x - 13 = 0
<=> x = 52
c) 7x. (2 + x) - 7x. (x + 3) = 14
<=> 14x + 7x2 - 7x2 - 21x = 14
<=> -7x = 14
<=> x = -2
Bài 1:tính
a)65.(-19)+19.(-35)
=65.(-19)+(-19).35
=(-19).(65+35)
=(-19).100
=-1900
b)85.(35-27)-35.(85-27)
=85.35-85.27-35.85+35.27
=(85.35-35.85)+(-85.27+35.27)
=27.(-85+35)
=27.(-50)
=1350
c)47.(45-15)-47.(45+15)
=47.[(45-15)-(45+15)]
=47.[30-60]
=47.(-30)
=-1410
Bài2: Tìm các số nguyên x biết
a)(-2).(x+6)+6.(x-10)=8
-2x-12+6x-60=8
4x-72=8
4x=72+8
4x=50
x=\(\frac{25}{2}\)
b)(-4).(2x+9)-(-8x+3)-(x+13)=0
-6x-36+8x-3-x-13=0
x-41=0
x=41
Bài 1: Tính
a) \(65.\left(-19\right)+19.\left(-35\right)\)
= \(-1235+-665\)
= \(-1900\)
b) \(85.\left(35-27\right)-35.\left(85-27\right)\)
= \(-1350\)
c) \(47.\left(45-15\right)-47.\left(45+15\right)\)
=\(-1410\)
Bài 2: Tìm x:
\(\left(-2\right).\left(x+6\right)+6.\left(x-10\right)=8\)
\(x=20\)
a, \(\left(x-1\right).\left(x+2\right)=0\\ \Rightarrow\left[{}\begin{matrix}x-1=0\\x+2=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=-2\end{matrix}\right.\)
b, \(\left(2x-4\right).\left(3x+9\right)=0\\ \Rightarrow\left[{}\begin{matrix}2x-4=0\\3x+9=0\end{matrix}\right.\left[{}\begin{matrix}2x=4\\3x=-9\end{matrix}\right.\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)
a) TH1: x-1=0 => x=1
TH2: x+2=0 => x=-2
b) TH1: 2x-4=0 <=> 2x= 4 <=> x=2
TH2: 3x+9=0 <=> 3x=-9 <=> x= -3
\(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x-13\right)=0\)
\(-8x-36+8x-3-x+13=0\)
\(-x-26=0\)
\(x=-26\)
-4(2x + 9) - (-8x + 3 ) -( x - 13) = 0
- 8x - 36 + 8x - 3 - 13 = 0
-x - 26 = 0
x = -26
k nha pizza
\(\Leftrightarrow-8x-36+8x-3-x-13=0\)
\(\Leftrightarrow-8x+8x-x=0+13+36+3\)
\(\Leftrightarrow-x=52\)
\(\Rightarrow x=-52\)
Vậy \(x=-52\)
-4. (2x + 9) - (-8x + 3) - (x + 13) = 0
-8x + (-36) - (-8x) - 3 - x - 13 = 0
-8x + (-36) + 8x + (-3) + (-x) + (-13) = 0
(-8x) + 8x + (-36) + (-3) + (-13) + (-x) = 0
(-52) + (-x) = 0
-x = 0 + 52
-x = 52
x = -52
\(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(-8x-36+8x-3-x-13=0\)
\(-x-52=0\)
\(x=-52\)