МЕТОД ГАУССА 1 1 + 2 + 3 +...+200= 2 7 + 9 + 11 +...+33= 3 9 + 12 + 15 +...+75= 4 ( 1 + 4 + 7 +...+22)+(1+8+15+...29)= 5 ( 1 + 3 + 5 +...+23)-(1+2+3+...+10)= 6 16 + 19 + 22 +...+58= 7 1 + 2 + 3 +...+500= 8 2 + 4 + 6 +...+1000= 9 222 + 333 + 444 +...+999= 10 54 + 64 + 74 +...+224=​ можно пж побыстрееееее ребят СРОЧНО
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