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Caisa422
a fost răspuns

Calculati,grupand convenabil termenii:
a)2+3+4+6+...+18+20=
b)1+2+3+....+29+30+35+500=

Răspuns :

a)2+18+4+16+6+14+8+12+10=90
b)29+1+28+2+27+3+26+4+25+5+24+6+23+7+22+8+21+9+20+10+19+11+18+12+17+13+16+14+15+35+500=970
Ionelacadar01
B. (1+500)×500÷2 501×250=125250

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