Question

Реши примеры с цепочкой: 289+(700+28) : 7 , 321-(640+8) : 8 , 568+(560+7) : 7 , 792+(810+9) : 9 , (240+16) :8 x 7 .

Answer 1

1, 393               2. 320     3. 1,129     4. 1,603          5. 254

Answer 2

289+(700+28):7=289+728:7=289+104=393;
321-(640+8):8=321-648:8=321-81=240;
568+(560+7):7=568+567:7=568+81=649;
(240+16):8•7=256:8•7=32•7=224

Answer 3

Calculation of the given expressions:

1. 289 + (700 + 28) + 7 To solve this expression, we need to perform the operations inside the parentheses first, then add the result to 289, and finally add 7 to the sum. - Inside the parentheses: 700 + 28 = 728 - Adding 728 to 289: 289 + 728 = 1017 - Adding 7 to 1017: 1017 + 7 = 1024

Therefore, the result of the expression 289 + (700 + 28) + 7 is 1024.

2. 321 - (640 + 8) + 8 Similar to the previous expression, we need to perform the operations inside the parentheses first, then subtract the result from 321, and finally add 8 to the difference. - Inside the parentheses: 640 + 8 = 648 - Subtracting 648 from 321: 321 - 648 = -327 - Adding 8 to -327: -327 + 8 = -319

Therefore, the result of the expression 321 - (640 + 8) + 8 is -319.

3. 568 + (560 + 7) + 7 Again, we perform the operations inside the parentheses first, then add the result to 568, and finally add 7 to the sum. - Inside the parentheses: 560 + 7 = 567 - Adding 567 to 568: 568 + 567 = 1135 - Adding 7 to 1135: 1135 + 7 = 1142

Therefore, the result of the expression 568 + (560 + 7) + 7 is 1142.

4. 792 + (810 + 9) + 9 Following the same steps as before, we perform the operations inside the parentheses first, then add the result to 792, and finally add 9 to the sum. - Inside the parentheses: 810 + 9 = 819 - Adding 819 to 792: 792 + 819 = 1611 - Adding 9 to 1611: 1611 + 9 = 1620

Therefore, the result of the expression 792 + (810 + 9) + 9 is 1620.

5. (240 + 16) / 8 x 7 To solve this expression, we need to perform the addition inside the parentheses first, then divide the result by 8, and finally multiply the quotient by 7. - Inside the parentheses: 240 + 16 = 256 - Dividing 256 by 8: 256 / 8 = 32 - Multiplying 32 by 7: 32 x 7 = 224

Therefore, the result of the expression (240 + 16) / 8 x 7 is 224.

I hope this helps! Let me know if you have any further questions.