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 biet (2x+1)+(2x+2)+...+(2x+2015)=0
giai giup em nha
tim x biet (2x+1)+ (2x+2)...+(2x+2015)=0
tìm x
tim x biet (2x+1)+(2x+2)+...+(2x+2015)
tim x biết (2x+1).(2+2)+...+(2x+2015)=0
Tim x la so tu nhien, biet:
x - 4/2015 - 1/2015 = 10 - 2x
tim x :(2x+1)+(2x+2)+..+(2x+2015)
Tim x ,biet :
(x-78):70=0
(x-2)x (2x-10)=0
2x(x-5)=0
2x(x-6) =0
(x-15)x15=0
tim x,y,z thuoc Z biet /2x-4/+/y+2/+/2x+3y-z/=0
tim x biet
/ 2x+1/+/x-2/=0
/x+5/=2x-1
/x+1/+/x+2/=/5x-3/
giup mik vs mai mik nop roi