Вставь пропущенные числа: 450 + □ = 600 − 80; 560 : □ = 490 : 7; 659 − □ = 100 + 275; 280 + 320 = □ − 300; 5 · □ = 225 − 150; □ · 16 = 540 − 444.

1. \(450 + x = 600 - 80\)
   \(450 + x = 520\)
   \(x = 520 - 450 = 70\)
2. \(560 : x = 490 : 7\)
   \(560 : x = 70\)
   \(x = 560 : 70 = 8\)
3. \(659 - x = 100 + 275\)
   \(659 - x = 375\)
   \(x = 659 - 375 = 284\)
4. \(280 + 320 = x - 300\)
   \(600 = x - 300\)
   \(x = 600 + 300 = 900\)
5. \(5 \cdot x = 225 - 150\)
   \(5 \cdot x = 75\)
   \(x = 75 : 5 = 15\)
6. \(x \cdot 16 = 540 - 444\)
   \(x \cdot 16 = 96\)
   \(x = 96 : 16 = 6\)

Ответ: 70; 8; 284; 900; 15; 6.