9. Quyidagi ifodalarning qiymatini toping: a) 30 + 30 ÷ 5; b) 42 × 10 − 20 ÷ 4; c) 10 + 72 ÷ 8 × 10; d) (60 − 15) ÷ 5.

Avval qavs ichidagi amalni, so‘ng ko‘paytirish va bo‘lishni chapdan o‘ngga, oxirida qo‘shish yoki ayirishni bajaramiz.

1. a) 30 + 30 ÷ 5 = 30 + 6 = 36.

2. b) 42 × 10 − 20 ÷ 4 = 420 − 5 = 415.

3. c) 10 + 72 ÷ 8 × 10 = 10 + 9 × 10 = 10 + 90 = 100.

4. d) (60 − 15) ÷ 5 = 45 ÷ 5 = 9.

Javob: a) 36; b) 415; c) 100; d) 9.