I b 380+x=510 C:16=80 24.X=480- (115+85).9= (500+45):5= (640+60).7=

Решение:

1. \( 380 + x = 510 \)
   \( x = 510 - 380 \)
   \( x = 130 \)
2. \( x : 16 = 80 \)
   \( x = 80 \cdot 16 \)
   \( x = 1280 \)
3. \( 24 \cdot x = 480 \)
   \( x = 480 : 24 \)
   \( x = 20 \)
4. \( (115 + 85) \cdot 9 = \)
   \( 200 \cdot 9 = 1800 \)
5. \( (500 + 45) : 5 = \)
   \( 545 : 5 = 109 \)
6. \( (640 + 60) \cdot 7 = \)
   \( 700 \cdot 7 = 4900 \)

Ответ: 1. x=130; 2. x=1280; 3. x=20; 4. 1800; 5. 109; 6. 4900.