Question

suma a cinci numere consecutive este 105 determinați numerele

Answer 1

a,b,c,d,e-nr. cautate
a,b,c,d,e-nr. nat. consecutive
a+b+c+d+e=105
b=a+1
c=a+2
d=a+3
e=a+4
_________
a,b,c,d,e=?
_________
a+a+1+a+2+a+3+a+4=105
5a=105-10
5a=95
a=95:5
a=19
b=19+1
b=20
c=19+2
c=21
d=19+3
d=22
e=19+4
e=23
~~~~~Probă:19+20+21+22+23=105

Answer 2

a+a+1+a+2+a+3+a+4=105
1+2+3+4=!0

105-10=95(de 5 ori a)
95:5=19(a)
19+1=20(al doilea nr)
20+1=21(al treilea nr)
21+1=22(al patrulea nr)
22+1=23(al cincilea nr)


proba: 23+22+21+20+19=105