1. Hisoblang: $$ 31 \cdot 27-28 \cdot 27+27 \cdot 23-24 \cdot 23+23 \cdot 19-20 \cdot 19 $$. A) 202 . B) 206 . C.) 207. D) 209 .

Question

UpStudy AI · Accepted Answer

Berilgan ifodani hisoblaylik:

$$ 31 \times 27 - 28 \times 27 + 27 \times 23 - 24 \times 23 + 23 \times 19 - 20 \times 19 $$

Avval har bir qismini guruhlaymiz va umumiy omilni ajratamiz:

$$ 27 \times (31 - 28) + 23 \times (27 - 24) + 19 \times (23 - 20) $$

Hisoblaymiz:

$$ 27 \times 3 + 23 \times 3 + 19 \times 3 = 3 \times (27 + 23 + 19) $$
$$ 3 \times 69 = 207 $$

Demak, to'g'ri javob:

**C) 207**
To'g'ri javob: C) 207

1. Hisoblang: \( 31 \cdot 27-28 \cdot 27+27 \cdot 23-24 \cdot 23+23 \cdot 19-20 \cdot 19 \). A) 202 . B) 206 . C.) 207. D) 209 .