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a fost răspuns

Cine face asta primeste coroana si repede terog
s=1+2+3+.................59
2sn=1+2+3+.....................180
3s=2+4 +6+...................256
4s=3+6+9+....................132

Răspuns :

Spidie
a)s=1+2+3+.................59=59*60/2= 1170
sn=1+2+3+.....................180= 180*181/2= 16290
s=2+4 +6+...................256=256*257/2= 32896
s=3+6+9+....................132= 132*133/2= 8778
1(1+2...+59=59x60:2=1770
2)1+2+3..++180=180x181:2=16290
3)2x(1+2+3..128)=
2x128x129:2=16515

3)3(1+2...44)=
3x44x45:2=2970

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