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2+4+6+.....+400 suma lui gauss


Răspuns :

Dam factor comun pe 2:
S = 2(1 + 2 + 3 + ... + 200) = 2 * 200 * 201 / 2 = 40 200
S=2+4+6+...+400
S=2 × (1+2+3+..+200)
S= 2 ×[tex] \frac{200*201}{2} [/tex]
S=2 ×[tex] \frac{40200}{2} [/tex]
S=2×20100
S=40200