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Alleeismyname
a fost răspuns

determinați numărul a care verifică egalitatea :
2015+a+3a+5a+...+99a+2016=17+2a+4a+...+100a

Răspuns :

2015+a(1+3+5+...99)+2016=17+2a(1+2+...50). 2015+2016+5050a=17+2ax1275
Danamocanu71
2015+a+3a+5a+...+99a+2016=17+2a+4a+...+100a
4031+a(1+3+5+...+99)=17+a(2+4+6+...+100)
4031+2500a=17+2550a
4014=25a
a=160,56