9. Ifodalarning qiymatini hisoblang. Javoblarni xona qo‘shiluvchilari yig‘indisi ko‘rinishida yozing. a) 578 + (77 − 49) : 4 · 6; b) 403 − 56 : 7 : 2; d) (35 + 37) : 9 + 297; e) 300 − (33 + 27 : 3) : 6.

Amallar tartibiga ko‘ra avval qavs ichidagi amallarni, so‘ng bo‘lish va ko‘paytirishni chapdan o‘ngga bajarib, natijalarni xona qo‘shiluvchilari yig‘indisi shaklida yozamiz.

1. a) 77 − 49 = 28; 28 : 4 · 6 = 7 · 6 = 42; 578 + 42 = 620 = 600 + 20.
2. b) 56 : 7 : 2 = 8 : 2 = 4; 403 − 4 = 399 = 300 + 90 + 9.
3. d) 35 + 37 = 72; 72 : 9 = 8; 8 + 297 = 305 = 300 + 5.
4. e) 27 : 3 = 9; 33 + 9 = 42; 42 : 6 = 7; 300 − 7 = 293 = 200 + 90 + 3.