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S=29+37+45+53+..+757

Răspuns :

Răspuns:

S=29+37+45+53+..+757

S=757+749+741+......+29

2S=786 de n ori

n=(757-29)÷8+1

n=91+1

n=92

2S=786×92

2S=72.321

S=72.321÷2

S=36.156