12. Hisoblang. \( 846900:((756+436): 4-289) \) ning \( \frac{3}{4} \) qismini; \( 2543 \cdot 184+29412:(65722-65646) \cdot 73+37 \) ning \( \frac{1}{100} \) qismini.

Birinchi ifodani hisoblaymiz: Avval \( 756 + 436 = 1192 \) natijasini olamiz. Keyin \( 1192 : 4 = 298 \) bo'ladi. Keyin esa \( 298 - 289 = 9 \). Endi, \( 846900 : 9 = 94211.11 \) (taxminan). Shundan keyin \( \frac{3}{4} \) qismini olish uchun, \( 94211.11 \cdot \frac{3}{4} = 70658.33 \) natijasiga ega bo'lamiz (taxminan). Keyingi ifodani hisoblaymiz: Birinchidan, \( 2543 \cdot 184 = 467912 \) natijasiga erishamiz. Keyin, \( 65722 - 65646 = 76 \) bo'ladi va \( 29412 : 76 = 387.32 \) (taxminan). Shundan so'ng, \( 387.32 \cdot 73 = 28363.36 \) (taxminan). Natijalarni qo'shadi: \( 467912 + 28363.36 + 37 = 496312.36 \) hisoblaymiz. Olingan natijaning \( \frac{1}{100} \) qismini eritib olamz: \( 496312.36 \cdot \frac{1}{100} = 4963.12 \) (taxminan). Natijalar: \( \frac{3}{4} \) qismini hisoblangan ifoda natijasi: \( 70658.33 \) \( \frac{1}{100} \) qismini hisoblangan ifoda natijasi: \( 4963.12 \)