6, 3, 0, -3, -6,……. Sonli ketma ketlikning ayirmasini toping., 3, -3, 2, Arifmetik progressiyada birinchi hadi 1 ga teng d= 2 bo’lsa, 15-hadini toping, 14, 30, 29, Arifmetik progressiyaning 10-hadi 42 ga, ayirmasi 4 ga teng. Birinchi hadini toping., 5, 4, 6, Butun sonlar qatori arifmetik progressiya tashkil etadimi?, yo'q, ha, to'g'ri javob yoʻq, arifmetik progressiyada "ayirma" nima, keyingi hadidan avvalgisini ayirish, oldingi hadidan keyingisini ayirish, n-hadidan birinchi hadini ayirish

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