giai giup em nha
tim x biet (2x+1)+ (2x+2)...+(2x+2015)=0
tìm x
tim x biet
a) 4(x+1)^2-9(x+2)^2=0
b) 4(x+1)^2+(2x-1)^2-8(x+1)(x-1)=11
giai cach lam giup minh nha
Bai 1. 12 chia het ( x + 3 )
bai 2. Tim so tu nhien x, biet 6x + 4 chia het cho 2x
cac ban nho giai chi tiet giup minh nha cam on
tim x biet (2x+1)+(2x+2)+...+(2x+2015)
tim x biet (2x+1)+(2x+2)+...+(2x+2015)=0
Có 2015 số hạng
Tổng là (2x+1+2x+2015).2015:2=0
4x+2016=0
4x=-2016
x=-504
Ủng hộ mk nha
( 2x + 1 ) + ( 2x + 2 ) + ... + ( 2x + 2015 ) = 0
=> ( 2x + 2x + .. + 2x ) + ( 1 + 2 + ... + 2015 ) = 0
2015 số 2x
=> 2x . 2015 + 2031120 = 0
=> 2x . 2015 = 0 - 2031120
=> 2x . 2015 = - 2031120
=> 2x = ( - 2031120 ) : 2015
=> 2x = - 1008
=> x = ( - 1008 ) : 2
=> x = - 504
=> ( 2x + 2x + .... + 2x + 2x ) + ( 1 + 2 + 3 + .... + 2015 ) = 0
=> ( 2x.2015 ) + { [ 2015.( 2015 + 1 ] : 2 } = 0
=> 4030x + [ ( 2015 . 2016 ) : 2 ] = 0
=> 4030x + ( 4062240 : 2 ) = 0
=> 4030x + 2031120 = 0
=> 4030x = - 2031120
=> x = - 2031120 : 4030 = - 504
Vậy x = - 504
tim x biet (2x+1)+(2x+2)+...+(2x+2015)=0
Có tất cả số 2x là:
(2015-1):1+1=2015(số)
Ta có:(2x+1)+(2x+2)+............+(2x+2015)=0
=>2015*2x+(1+2+3+............+2015)=0
=>4030x+2031120=0
=>4030x=-2031120
=>x=-504
Tim x va so tu nhien n, biet:
x2 + 2x + 4n - 2n+1 = -2
giai nhanh giup minh nha, minh dang can gap ! THANHS nhiu!
Tim x biet :
7x+2 +7x+1+7 /57 = 52x +52x+1+52x+3 /131
Nhanh tay giai giup to di may than dong toan oi
tim x biet: |x-2|-|2x+3|-x=-2
nho tra loi nhanh giup minh nha
Tim x, biet : |x-2|+2x+1=0
Giup mik nhe !!!
Ta có |x-2|+2x+1=0
\(\Leftrightarrow\left|x-2\right|=-1-2x\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=-1-2\\x-2=1+2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-1\\x=3+2=5\end{cases}}\)
Vậy \(x\in\left\{-1;5\right\}\)
@ Học tốt !!!
## Chiyuki Fujito