\(\left(x+2\right)\times\left(2+x\right)=\frac{1}{2}-\frac{1}{3}\)
\(\left(x+2\right)\times\left(2+x\right)=\frac{1}{6}\)
\(\left(x+x\right)\times\left(2+2\right)=\frac{1}{6}\)
\(x\times2\times4=\frac{1}{6}\)
\(x\times2=\frac{1}{6}:4\)
\(x\times2=\frac{1}{24}\)
\(x=\frac{1}{24}:2\)
\(x=\frac{1}{48}\)
Tim x biet 1+1/2(1+2)+1/3(1+2+3)+...+1/x(1+2+3+...+x)=115
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
C(x)=-2x(2x-3)-2(x-1)
Q(x)=2(x-3)-(x-1)
Tim nghiem
Tim x :3|x+1|-2|2+x|+|1-x|=4
tim x
\(\frac{2^x+2^{x+1}+2^{x+2}}{7}=\frac{3^x+3^{x+1}+3^{x+2}}{13}\)
bai 11;tim x
1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)-1/x=1/2010
x-1/x+2=x-2/x+3 tim x
Tim x,y,z biet:
1)|x|+|1-x|+|x+2|=5
2)|x-1/2|+|y+2\3|+|x^2+xz|=0
