(1+3+...+99)x = 2+4+6+100
2500x=2550
x=2550:2500
x= 1,02
Kẻ bí mật này, tớ tưởng 2+4+6+100=112 chứ?! Sao ra 2550 giỏi vậy! Đúng là ấm đầu thiệt rùi!
tim x, y biet 4*x = 3*y va x^2+y^2=100
tim x biet :
-x-2/3=-6/7
4/7-x=1/3
1)tim x biet rang:
a)3^x-1=1/243
b)2^x+2^x+3=144
c)81^-2x.27x=9^5
2)tim tiep so ghang thu 5 cua day so sau:-1/a^2;2/a^3;-6/a^4;24/a^5;...
3)tim so tu nhien x biet :
a)4^x+4^x+3=4160
b)2^x-1+5.2^x-2=7/32
tim x,biet:
a,x+1/3 =3/4
b,-x-2/3=6/7
biet t/x = 4/3; y/z = 3/2; z/x = 1/6. Tim t/y
Tim x biet 4/15 +1/6-5/9 > 2/3-x-3/4
Ai dung 5 sao lun
Tim x,y,z biet (x-1)/2= (y+3)/4 =(z-5)/6 va 5z-3x-4y
Tim x biet (x+1)(x+2)(x+3)+...+(x+100)=5750
giup minh voi nhe
Tim x biet:
a.2|2x-3|=1/2
b.(x-1)^2=9/16
c.3/5(x-5/6)-1/2(3/2-1)=-1/4
d.1/3+1/6+1/10+......+2/x(x+1)=2015/2016
