Các câu hỏi tương tự
Tim x biet
7/x-1=x+1/9
Tim x biet
1/1*3+1/3*5+1/5*7+1/7*9+...+1/x(x+2)=16/34
Tim x biet
1/1*3+1/3*5+1/5*7+1/7*9+...+1/x(x+2)=16/34
tim x, biet
a/ (72 -x)/7 = (x-70) /9
b/ (x-1)/(x+2) = (x-2)/(x+3)
Tim x biet;
\(x^2-1=\frac{7}{9}\)
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)-1 + 3 + ( -5) + 7 + ...+ x = 600
b) 9 nho hon bang |x - 3| < 11
Tim xthuoc Z biet:
1,|2x-5|-|2x+9|=0
2,|x+1|-|x+2|-|3-x|=7
3,|2x+3|+|3x+2|-|4-x|=10
Tim x biet
(x+1/5)-4=-2
(2x+3)*(x-7)=0
31/9(x)-5/2=8/3