a. ( 1+2+3+...+36 ) ÷ ( -18 ) =
= (36×37 ÷ 2) ÷ (-18)
= 18×37 ÷ (-18)
= - 37
b. ( -1-2-3-...-25 ) ÷ ( -26 ) =
= - (1 + 2 + .. + 25) ÷ (-26)
= - (25×26 ÷ 2) ÷ (-26)
= 25/2
Răspuns:
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a. ( 1+2+3+...+36 ) ÷ ( -18 ) =
= (36×37 ÷ 2) ÷ (-18)
= 18×37 ÷ (-18)
= - 37
b. ( -1-2-3-...-25 ) ÷ ( -26 ) =
= - (1 + 2 + .. + 25) ÷ (-26)
= - (25×26 ÷ 2) ÷ (-26)
= 25/2
Răspuns: