What multiplication formulas can I write with 2, 3, 5, decimal point and multiplication sign

2.3*5,2.5*3,3.2*5,3.5*2,5.2*3,5.3*2

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1. How many decimal multiplication formulas can you write with the three numbers of 7, 8 and 5, as well as the decimal point "." and multiplication sign
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3. Given the function y = (A-X) / (x-a-1), the center of symmetry of the image is (3, - 1), then the real number a is equal to
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12. Fill in 10 numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 in □, and each number is used only once
13. Fill in 10 numbers of 0123456789 in (), each number can only be used once () + () = () - () = () - () = () - () = () - () = ()-（
14. 0-9 ten sequence of five addition formula, each number only once 0123456789 ten numbers are filled in (), each number is used only once. () + () = () + () = () + () = () + () = () + () = () + ()
15. 0123456789 how to make up the vertical column of addition with ten numbers
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