78. Arifmetik progressiyaning hadlari 19 ta. Uning o’rta hadi 21 ga teng. Shu progressiyaning hadlari yig’indisini toping.
79.15 ta haddan iborat arifmetik progressiyaning sakkizinchi hadi 18 ga teng. Shu progressiyaning hadlari yig’indisini toping.
80. Arifmetik progressiyaning o’n uchinchi hadi 5 ga teng. Uning dastlabki 25 ta hadlarining yig’indisini toping.
81.Arifmetik progressiyaning dastlabki 13 ta hadi yig’indisi 104 ga teng. yettinchi hadining kvadratini toping.
82. Arifmetik progressiyaning beshinchi hadi 6 ga teng. Uning dastlabi to’qqizta hadi yig’indisini toping.
83. Arifmetik progressiyaning birinchi va to’qqizinchi hadlari yig’indisi 64 ga teng. Shu progressiyaning dastlabki to’qqizta hadlari yig’indisi va beshinchi hadi ayirmasini toping.
84. 21 ta hadining yig’indisi 546 ga teng bo’lgan arifmetik progressiyaning o’n birinchi hadini toping.
85. Arifmetik progressiya birinchi o’nta hadining yig’indisi 140 ga teng bo’lsa, ni aniqlang.
86. Agar arifmetik progressiyada bo’lsa, ni hisoblang.
87. Arifmetik progressiyaning uchinchi, yettinchi, o’n to’rtinchi va o’n sakkizinchi hadlarining yig’indisi 48 ga teng. bu progressiyaning dastlabki 20 ta hadi yig’indisini toping.
88. arifmetik progressiyaning dastlabki n ta hadi yig’indisi 120 ga teng. Agar bo’lsa, yig’indida nechta had qatnashgan?
89. Arifmetik progressiyaning dastlabki to’rtta hadi yig’indisi 124 ga, oxirgi to’rttasiniki 156 ga teng. progressiyaning hadlari yig’indisi 350 ga teng. progressiyaning nechta hadi bor?
90. Agar va bo’lsa, arifmetik progressiyaning hadlar sonini toping.
91. Arifmetik progressiya uchun bo’lsa, ni toping.
92 arifmetik progressiyaning dastlabki n ta hadi yig’indisi bo’lsa, ning qiymatini toping.
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