Răspuns :
48,563 +
280,030
4000,000
123,150
64,320
1024,33
__________
5540,393 - suma celor sase numere
M.a.=(5540,393)/6=923 intregi (39883-3988)/90000
=83105895/90000
(5540,393+x)/7 = 83105895/90000 + 2315/100
5540,393+x=66258,418(3)
x=60718,025(3)
280,030
4000,000
123,150
64,320
1024,33
__________
5540,393 - suma celor sase numere
M.a.=(5540,393)/6=923 intregi (39883-3988)/90000
=83105895/90000
(5540,393+x)/7 = 83105895/90000 + 2315/100
5540,393+x=66258,418(3)
x=60718,025(3)
a) (48,563+280,03+4000+123,15+64,32+1024,33):6=5540,394:6=923,3988(3)
b) 923,3988(3)+23,15=946,5488(3) (media a. crescuta cu 23,15)
946,5488(3)x7=6625,84(3) (suma nr. cu cel necunoscut)
6625,84(3)-5540,394=1085,4478(3) (diferenta dintre suma primelor 6 nr si suma cu al saptelea nr.)
R: Mai este nevoie de nr. 1085,4478(3)