9 matematika uzb

olimpiada topshiriqlari (ii tuman bosqichi) matematika 9 fan olimpiadalari bo‘yicha iqtidorli o‘quvchilar bilan ishlash departamenti 1-qism: har bir topshiriq 0,9 balldan baholanadi 1. hisoblang �1 3 4 : 1,125 − 1,75: 2 3 � ∙ 1 5 7 a) −1 7 12 b) −1 1 4 c) −1 5 6 d) −1 1 3 2. soddalashtiring: 27𝑎𝑎 3−64𝑏𝑏3 𝑏𝑏2−4 :9𝑎𝑎 2+12𝑎𝑎𝑎𝑎+16𝑏𝑏2 𝑏𝑏2+4𝑏𝑏+4 a) (3𝑎𝑎−4𝑏𝑏)(𝑏𝑏+2) 𝑏𝑏−2 b) (3𝑎𝑎−4𝑏𝑏)(𝑏𝑏−2) 𝑏𝑏+2 c) (3𝑎𝑎+4𝑏𝑏)(𝑏𝑏+2) 𝑏𝑏−2 d) (3𝑎𝑎+4𝑏𝑏)(𝑏𝑏−2) 𝑏𝑏+2 3. agar 3𝑥𝑥 − 𝑦𝑦 = 7 va 5𝑥𝑥 + 4𝑦𝑦 = 21 bo‘lsa, 24𝑥𝑥 + 9𝑦𝑦 ni hisoblang. a) 90 b) 78 c) 69 d) 84 4. chizmada ∠𝐴𝐴𝐴𝐴𝐴𝐴 = 120∘,∠𝐵𝐵𝐵𝐵𝐵𝐵 = 3∠𝐴𝐴𝐴𝐴𝐴𝐴 𝑣𝑣𝑣𝑣 ∠𝐴𝐴𝐴𝐴𝐴𝐴 = 2∠𝐶𝐶𝐶𝐶𝐶𝐶 bo‘lsa, ∠𝐵𝐵𝐵𝐵𝐵𝐵 burchak nimaga teng? a) 45∘ b) …

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