2^3+3^3+4^3+...+20^3=? Giup minh giai bai nay nhe giai thich cach lam nhe cac ban
B = 345678912 ^ 2
Giai thich cach lam gium nha!
minh can cach lan
ai nhanh minh tk
cac ban lam gappp giup minh nhe
thay cac chu so a,b,c boi cac so thich hop de so A=\(\overline{579abc}\)\(chiahetcho5,7,9\)
Cho 2 so a;b<5 (a<b).UCLN(a;b)=5. BCNN(a;b)=30.
a)Tim 2 so a;b?
b)Giai thich cach lam?
Bai 2: Cho 2 so 2^2012 va 5^2012 co gia tri khi viet lien nhau se tao thanh so co bao nhieu chu so?Giai thich cach lam?
a+x =5 a-x =2 neu duoc giai thich cach lam luon cho minh nhe
So sanh hai luy thua
102 ........210
giai thich cach lam
cho m=2+2^2+2^3+2^4+............+2^20
chung to m chia het cho 5. giai thich va neu cach lam
axb=a+b
giup minh voi tim giai bai nay voi (mac giu minh biet ket qua nhung ko bik cach lam)
tim x biet:
a, 8x - 75 = 5x + 21
b, 9x + 25 = -( 2x - 58 )
c, / 2x - 1 / = /-5/
Giup minh lam bai nay voi ca cach lam nua nhe