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 so tu nhien x,y biet x*20+(x+1)*11=2020*y
* la mu nha
tim x , y tu nhien biet (x^2+1)(2^x+2)(2^x+3)(2^x+4) +15^y=1679
tim cac so tu nhien x,y biet \(^{2^{x+1}}\).\(^{3^y}\)=\(^{12^x}\)
do dai ba canh cua tam giac ABC co do dai banh 4;12;x biet x la mot so tu nhien . tim x ( cho biet moi canh cua tam giac nho hon tong hai canh va lon hon hieu cua chung)
Tim cac so tu nhien x va y biet
25 - y2 = 8( x -2016 )2
tim so tu nhien x thoa man 3^x+4^x=5^x
Tim So Tu Nhien x biet:
a)113+x chia het cho 7
b)113+x chia het cho 13
AE nao biet lam thì trả lời dùm mình nha(nhờ giải thích cho mình với nha):D
tim x biet /x+1/+/x+3/+....+/x+2013/=2014x
mk dg can gap ai lm dc mk tick cho 3 cai