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The answer to the training of library interesting thinking
1.Storybook = 1600 divided by [1+2+3X3]

2. White rabbits and gray rabbits divide by [8+5] by [2- 1]+8.

Column 2 is a differential problem =. =

Sum times problem = [sum+difference] divided by [multiple+1]

Differential multiple problem = [sum+difference] divided by [multiple-1]