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(x+1)+(x+2)+(x+3)+........(x+100)=1990+406x
Avem nevoie de rezolvare detaliata si explicatie, va rog...


Răspuns :

x+x+x..x(de 100 ori)=100x
1+2+...100=
100x101:2=5050

avem urmatoarea ecuatie
1990+406x=5050+100x
calculam
406x=5050-1990+100x
406x=3060+100x
306x=3060
x=3060:306
x=10
sper din suflet ca ai inteles!