The number of columns in regular order: 2, - 4, 8, - 16, 32, - 64 The sum of some four adjacent numbers is - 640. What is the difference between the largest number and the smallest number? | Math enthusiast | Mathematical art

The number of columns in regular order: 2, - 4, 8, - 16, 32, - 64 The sum of some four adjacent numbers is - 640. What is the difference between the largest number and the smallest number?

Let the first of the four adjacent numbers be x, then the last three numbers are - 2x, 4x, and - 8x in turn. From the meaning of the question, we can get: x-2x + 4x-8x = - 640, and the solution is: x = 128. Then - 2x = - 256, 4x = 512, and - 8x = - 1024. ｜ 512 - (- 1024) = 1536

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