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a*(a+3) + 138 = (a+6)(a+9)
a^2 + 3a +138 = a^2 + 6a + 9a +54
a^2 + 3a +138 = a^2 + 15a + 54
12a = 84
a= 7
liczby to 7, 10, 13, 16
x+3 -II liczba
x+6 -III liczba
x+9 -IV liczba
x(x+3)+138=(x+6)(x+9)
x²+3x+138=x²+9x+6x+54
x²+3x-x²-9x-6x=54-138
-12x=-84 /:(-12)
x=7
x+3=7+3=10
x+6=7+6=13
x+9=7+9=16
ODP. SZUKANE LICZBY TO 7,10,13,16.
POZDRAWIAM :)