-x-2/3=-6/7
=>-x=-6/7+(-2/3)
=>-x=-32/21
=>x=32/21
4/7-x=1/3
=>x=4/7-1/3
=>x=5/21
-x-2/3=-6/7
=>-x=-6/7+(-2/3)
=>-x=-32/21
=>x=32/21
4/7-x=1/3
=>x=4/7-1/3
=>x=5/21
tim x,biet:
a,x+1/3 =3/4
b,-x-2/3=6/7
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-2 trên 5 =3/8
b) x-1 trên x+5=6/7
c)x2 trên 6=24/25
Tim x biet:
\(\frac{6}{x^2+2}+\frac{12}{x^2+8}=3-\frac{7}{x^2+3}\)
1 tim cac so nguyen x,y biet x/7=6/21 -5/y=20/28 1/2=x/12 x/8=-28/32 3/y=12/24 3/4=15/y 2 viet 3 phan so bang phan so -10/15
tim x biet (x^2-1)(x^2-3)(x^2-5)(x^2-7)<=0
tim x biet 2x+1/x-2=2x-3/x+6
Tim x,y,z biet:
(2|x|+5)/3=(3|y|-1)/5=(3-z)/7 va 2|x|+7|y|+3z=-14
tim x biet (1+3+....+99)x=2+4+6+.....+100
