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VA ROG URGENT

calculați următoarele sume:
a 2+2+4+...+50;
d 1+2+3+...124;
g 5+6+7+...81;
b 1+2+3+...+500;
e 2+4+6+...+600;
h 1+2+3+...+512;
c 1+97+2+999+3+198;
f 15+16+17+...+70
i 317+318+319+...+400​