Question

Adunați toate numerele de 2 cifre care împărțite la 7 dau rest 2

Answer 1

a/7=2r2
a=2*7+2
a=14+2
a=16

a/7=3r2
a=7*3+2
a=21+2
a=23

a/7=4r2
a=4*7+2
a=28+2
a=30

a/t=5r2
a=5*7+2
a=35+2
a=37

a/6=2r2
a=7*6+2
a=42+2
a=44

a/7=7r2
a=7*7+2
a=49+2
a=51

a/7=8r2
a=7*8+2
a=56+2
a=58

a/7=9r2
a=9*7+2
a=63+2
a=65

a/7=10r2
a=7*10+2
a=74

a/7=11r2

a=11*7+2
a=79

a/7=12r2
a=86
a/7=13r2

  a=93

16+23+30+37+44+51+58+65+74+79+93=570