(1) First of all, five digits multiplied by four equals five digits, so these five digits must be less than 25000, then "cong" must be 1 or 2, and the mantissa of digits obtained by multiplying "xue" by four must be even, so "cong" can only be 2, so "xue" = 2 * 4 = 8;

② If "Xiao" *4 does not carry, then "Xiao" must be 1 or 2 and "Xue" *4=32, then the mantissa of "number" *4+3 is "Xiao", which means that "Xiao" is odd, so it is1; Then "number" is only 7 ("number" is not 2 because "small" * 4+b >；; 4);

(3) Because "small" *4+b= "number" (b is the decimal number of "love" *4), then b is 3, so there is the formula a*4+3=3a (let "love" be a and 3a be a two-digit number), we can see that a=9, that is, "love" is 9;

To sum up: I loved mathematics since I was a child =2 1978.