Question

URGENTTT DAU COROANA VA ROGGG
A)Determinati numerele a si b,stiind ca suma lor este 431,iar2×A+5×B=1696
B)Determinati nr a si b,stiind ca suma lor este 497,iar 3×A+7×B=2791
C)Determinati nr a si b,stiind ca suma lor este 315,iar 4×A+7×B=1875

Answer 1

A)a+b=431      2a+2b=431×2=862
2a+5b=1696    2a+5b-2a-2b=1696-862
                                3b=834
                                 b=278     a=431-278=153

B) a+b= 497               3a+3b=497×3=1491
3a+7b=2791               3a+7b-3a-3b=2791-1491
                                      4b=1300    b=325     a=497-325=172

C) a+b=315              4a+4b=315×4=1260
 4a+7b=1875            4a+7b-4a-4b=1875-1260
                                          3b=615
                                           b=205   a=315-205=110