Question

va rog dau coroana si marchez ca cel mai bun urgennnnt haiii. ::: determinati numerele a.b si c direct proportionale cu numerele 0,(3);1,5 si 1.25 stiind ca 7a -b+3c=110

Answer 1

a / 0,(3) = b / 1 , 5 = c / 1 , 25 = K

a = 0,(3) × K = 3 / 9 × K = K / 3

b = 1 , 5 × K = 15 / 10 × K = 3K / 2

c = 1 , 25 K = 125 / 100 × K = 5K / 4

7a - b + 3c = 110

7 × K / 3 - 3K / 2 + 15 / 4 = 12 / 110

28K - 18K + 45K = 1320

55K = 1320

K = 1320 / 55 ( 5 = 264 / 11

a = 88 / 11

a = 8

b = 3 / 11

b = 396 / 11 => b = 36

c = 5 × 11 =

c = 30

Answer 2

Rezolvarea in atasament