19) a+(a+1)+(a+2)+(a+3)+(a+4)=615 060
a+a+1+a+2+a+3+a+4=615 060
5a+10=615 060/-10
5a=615 050/:5
a=125 010 125010; 125 011; 125 012; 125 013; 125 014
R. 125 012
17) l+ll=66 ll+lll=53 l+lll=93
l+ll+ll+lll+l+lll=66+53+93
2×l+2×ll+2×lll=212
2(l+ll+lll)=212 /:2
l+ll+lll=106
l=106-53 l=53
ll=106-93 ll=13
lll=106-66 lll=40 R. 53; 13; 40
1(8) m+n=196
n+p=422
m+p=378
(m+n)+(n+p)+(m+p)=196+422+378
m+n+n+p+m+p=996
2×m+2×n+2×p=996
2(m+n+p)=996/:2
m+n+p=498
m=498-422 m=76
n=498-378 n=129
p=498-196 p=302
m<n<p