San yil Sinf: 9-sinf Fan

Dars uslubi : Yozma ish

Tashkiliy qism.

Salomlashish. Navbatchining o’quvchilar davomati, darsga tayyorligi to’g’risidagi axborotini tinglash.

Darsning borishi:

I variant

1. Ifodani soddalashtiring : 

2. Hisoblang:  .

3. Agar arifmetik progressiyada d=-3, a₁₁=20 bo’lsa, uning birinchi hadini toping.

4. Cheksiz kamayuvchi geometrik prograssiyada  bo’lsa, bu progressiya yig’indisini toping.

5. Agar (b_n ) geometrik progressiyada b₁=8,  bo’lsa, dastlabki beshta hadlarining yig’indisini toping.

II variant

1. Ifodani soddalashtiring : ctgα+sin²α+ctg²a*sin²a

2. Hisoblang:  .

3. Agar arifmetik progressiyada a₂₁=-10, a₂₂=-5,5 bo’lsa, uning birinchi hadini toping.

4. Cheksiz kamayuvchi geometrik prograssiyada  bo’lsa, bu progressiya yig’indisini toping.

5. Agar (b_n ) geometrik progressiyada b₁=3,  bo’lsa, dastlabki oltita hadlarining yig’indisini toping.

Yechimlari:

I variant

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