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The sixth grade math problem (20 1 1 Hope Cup) is really a problem! I hope you can help me do it.
1. Define a new operation for any two numbers x and y, and the operation rules are as follows: (? Is an operation symbol)

x？ Y = X times Y-X divided by 2, X +Y=X+Y divided by 2.

According to this rule, 3.6? 2 = 5.4,0.12 (12 cycle)? (7.5+4.8)=_ 1.430(30 cycles)

2. in? Fill in two adjacent natural numbers respectively, and the following formula holds. 、

1

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