Question

1. Diferenta a doua numere este 12,2 , iar media lor aritmetica este egala cu 34,2. Determinati numerele.
2. Un numar natural de doua cifre este 2supra9 din rasturnatul sau. Care este numarul.
Dau coroana

Answer 1

Problema nr 1 rezolvare:                                                                                             a si b sunt cele 2 numere
a-b=12,2
a+b/2=34,2
a+b=34,2x2
a+b=68,4
a-b=12,2=>a=12,2+b
inlocuim
12,2+b+b=68,4
2b=68,4-12,2
2b=56,2
b=56,2/2
b=28,1
a-b=12,2=.>
a-28,1=12,2
a=28,1+12,2
a=40,3                                                                                                                                                                                                             Problema nr 2 rezolvare:                                                                                                                                                                                                                              ab=2/9*ba
10a+b= 2*(10b+a)/9  ⇒ 9*(10a+b)=2*(10b+a)
90a+9b=20b+2a
88a=11b
8a=b
rezulta ca a=1 si b=8
verificare 18=2*81/9                                                                                                                                    MA BUCUR CA TE-AM AJUTAT !!!