1) tim x thuoc n biet:

a) 3 mu 4 - x = 81

b) 5 mu x -1 = 125

c) (2 - x) mu 3=27 mu 0

d)3 mu x + 2 -3 mu x +1=182

e) 2 mu x -1  -2 mu x =16

tim m va n la so tu nhien biet a,2 mu m tru 2 mu n bang1984      

b;6 mu m chia 2 mu 1996 bang 3 mu n

1.tim x thuoc n biet:

a)3 mu x .3             b)x mu 20 = x         c)2 mu x.16 mu 2=1024        d)64.4 mu x=16 mu 8

2.tim n thuoc n sao:

a)3 mu 2.3 mu n=3 mu 5              b)(2 mu 2:4).2mu n=4         c)32<2 mu n<128         d)2.16>_2 mu n>4

ai giai dung va nhanh minh tick cho

so chinh phuong la so bang binh phuong cua mot so tu nhien ( vi du 0 ,1,2,4,9,16,...0) moi tong sau day co so chinh phuong ko

a) 1mu 3 +2 mu 3

b)1mu 3+2mu 3 +3 mu 3

c)1 mu 3+ 2 mu 3 + 3 mu 3 +4 mu 3

tai minh ko biet go dau mu !

tim n biet :

a) 2 mu n = 2   b) am 3 mu n chia 8 mu 1    c) 8 mu n chia 2 mu n =4

tim so tu nhien abc  nhat thoa man 

abc= n mu 2 -1 va cba= n mu 2 -4n +4

tim so tu nhien x biet 

(2.x+1)mu 5 /(2.n+1)mu 2=1

2 mũ x+2 .2 mu x+........+10.2 mu x =10 . 11

dau / nay la dau chia

dau . nay la nhan do nhe!!!!

chung to rang 1 tren 1 mu 2 + 1 tren 1 mu 3+...+1 tren n mu 2( voi n thuoc N sao) ko phai la mot so tu nhien

a, (1/2)mu x =64

b, x mu 3 +27 =0 

c, 3 mu 2 /2 mu n =4

d,  625 / 5 mu n = 5

e, 27 mu n . 3 mu n = 3 mu 2 

so sanh 

a, 3 mu 200 va 2 mu 300

b, 2 mu 225 va 3 mu 150