Question

por favor es urgente​

Answer 1

Respuesta:

19

Explicación paso a paso:

a1 + a2+a3+....+a9 = 6bc

10a+1 + 10a + 2 + 10a+3+..+10a+9 = 6bc

90a+ 1+2+3+..+9 = 6bc

90a + 9(10)/2= 6bc

90a + 45 = 6bc

600 ≤ 6bc ≤ 699

600 ≤ 90a+45 ≤ 699

600-45 ≤ 90a ≤ 699-45

555 ≤ 90a ≤ 654

555/90 ≤ a ≤ 654/90

6,16... ≤ a ≤ 7,26...

☞ a = 7

90a + 45 = 6bc

90×7 + 45 = 6bc

630+ 45 = 6bc

675 = 6bc

b = 7

c = 5

a+b+c = 7+7+5 = 19