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Hey va roggg sa ma ajutati si pe mine va rogg este FOARTE URGENT
P.S. Faceti doar ce stiti dar sa fie raspunsuri complete Nu incomplete


Hey Va Roggg Sa Ma Ajutati Si Pe Mine Va Rogg Este FOARTE URGENT PS Faceti Doar Ce Stiti Dar Sa Fie Raspunsuri Complete Nu Incomplete class=

Răspuns :

10..1+2+3+...+30=30*31:2=465
11+22+33+...330=11(1+2+3+...33)=11*33*34:2=6171
5+10+15+...+150=5(1+2+3+...+30)=5*30*31:2=2325
11...
3+5+7+...+2003=3+(3+2*1)+(3+2*2)+...+(3+2*1000)=3+3+..+3+2(1+2+...+1000)=3*1001+2*1000*1001:2=3003+1001000=1004003
2+4+6+...+2002=2(1.2+3+...1001)=2*1001*1002:2=1003002

3+5+7+...+2003-2-4-6-...-2002=3+5+7+...+2003-(2+4+6+...+2002)=1004003-1003002=1001

12...
a. 11+22+33+44+55+66+77+88+99=11(1+2+3+..+9)=11*9*10:2=495
b. 111+222+333+...+999=111(1+2+3+...+9)=111*9*10:2=4995

13..
axb=4984
axb+2xa=5096
4984+2xa=5096
2xa=5096-4984
2xa=112
a=112:2
a=56

axb=4984 si a=56⇒b=4984:56=89

14...
892·x+18·x=9100
910·x=9100
x=9100:910
x=10

75·x+24·x=990
99·x=990
x=990:99
x=10

37·x+73·x=11100
111·x=11100
x=11100:111
x=100