\frac{x-10}{2010}+\frac{x-8}{2012}+\frac{x-6}{2014}+\frac{x-4}{2016}+\frac{x-2}{2018}=\frac{x-2018}{2}+\frac{x-2016}{4}+\frac{x-2014}{6}+\frac{x-2012}{8}+\frac{x-2010}{10}
x*4+x*6+x*8=2016
\(x.4+x.6+x.8=2016\)
\(x.\left(4+6+8\right)=2016\)
\(x.18=2016\)
\(x=2016:18\)
\(x=112\)
Chúc bạn học giỏi
Ai không ấn vào chữ Đúng là chó
bài này ở bài thứ nhất,bài tăng dần mình 100 điểm bằng 112 nha, xin lỗi mình đang vội.
1,2+1,4+....+9,8=bao nhieu vay cac ban?
X x 4 + X x 6 + X x 8 = 2016
X x 4 + X x 6 + X x 8 = 2016
X x ( 4 + 6 + 8 ) = 2016
X x 18 = 2016
X = 2016 : 18
X = 112
X x ( 4 + 6 + 8 ) = 2016
X x 18 = 2016
X = 2016 : 18
X = 112
2/(2 x 4) + 2/(4 x 6) + 2/(6 x 8) + ..... + 2/(2014 x 2016)
\(\frac{2}{2.4}+\frac{2}{4.6}+\frac{2}{6.8}+....+\frac{2}{2014.2016}\)
\(=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+......+\frac{1}{2014}-\frac{1}{2016}\)
\(=\frac{1}{2}-\frac{1}{2016}\)
\(=\frac{1008}{2016}-\frac{1}{2016}=\frac{1007}{2016}\)
\(\frac{2}{2\times4}+\frac{2}{4\times6}+...+\frac{2}{2014\times2016}\)
=\(\left(\frac{2}{2}-\frac{2}{4}\right)+\left(\frac{2}{4}-\frac{2}{6}\right)+...+\left(\frac{2}{2014}-\frac{2}{2016}\right)\)
=\(\frac{2}{2}-\frac{2}{4}+\frac{2}{4}-\frac{2}{6}+...+\frac{2}{2014}-\frac{2}{2016}\)
=\(\frac{2}{2}-\frac{2}{2016}=\frac{1007}{1008}\)
A,2 x 32 x 12 + 4 x 6 x 41 + 8 x 27 x 3
B,(2006 x 2005^2016 - 2005^2016) : 2005^2017
`#3107.101107`
A,
\(2\times32\times12+4\times6\times41+8\times27\times3\\ =24\times32+24\times41+24\times27\\ =24\times\left(32+41+27\right)\\ =24\times100\\ =2400\)
B,
\(\left(2006\times2005^{2016}-2005^{2016}\right)\div2005^{2017}\\ =\left[2005^{2016}\times\left(2006-1\right)\right]\div2005^{2017}\\ =\left(2005^{2016}\times2005\right)\div2005^{2017}\\ =2005^{2017}\div2005^{2017}\\ =1\)
2 x 3 x 12 + 4 x 6 x 42 + 8 x 27 x 3
= 2 x 12 x 3 + 4 x 6 x 42 + 8 x 3 x 27
= 24 x 3 + 24 x 42 + 24 x 27
= 24 x ( 3 + 42 + 27 )
= 24 x 72
= 1728
Nho tick cho minh nhe ban😁
Tìm x, biết:
(20165:20164-1/2-20178:20176)-x/2016= 2017/2016.
2+(-4)+6+(-8)+.....+x= 2016
Giá trị của X, biết:
X x 4+ X x 6+ X x 8=2016
Xx4+Xx6+Xx8=2016
Xx(4+6+8)=2016
Xx18=2016
X=2016/18
X=112
Xx4+Xx6+Xx8=2016
Xx(4+6+8)=2016
Xx18=2016
x=112
tìm x,y biết :
a, 3 - 2x = 3.(5-x) + 4
b, 4 - ( 7x + 2017 ) = 6 . ( 5-x) - 2017
c, 15 - x (x+1) = 4 - x^2 + 2x
d, -4.(x-5) + 2016 = 3.(8-x)-(2x - 2016)
a, 3 - 2x = 3 . (5 - x) + 4
3 - 2x = 15 - 3x + 4
-2x + 3x = 15 + 4 - 3
x = 16
b, 4 - (7x + 2017) = 6 . (5 - x) - 2017
4 - 7x - 2017 = 30 - 6x - 2017
-7x + 6x = 30 - 2017 - 4 + 2017
-x = 26
x = -26
c, 15 - x . (x + 1) = 4 - x^2 + 2x
15 - x^2 - x = 4 - x^2 + 2x
-x^2 - x + x^2 - 2x = 4 - 15
-3x = -11
x = 11/3
d, -4 . (x - 5) + 2016 = 3 . (8 - x) - (2x - 2016)
-4x + 20 + 2016 = 24 - 3x - 2x + 2016
-4x + 3x +2x = 24 + 2016 - 20 - 2016
x = 4
đúng 100%