If x and y are opposite to each other, m and N are reciprocal to each other, | a | = 2, find a & sup2; - (x + y + Mn) a + X & sup2; & ordm; & sup1; & sup1; + (- Mn) & sup2 If x and y are opposite to each other, m and N are reciprocal to each other, | a | = 2 Find the value of a & sup2; - (x + y + Mn) a + X & sup2; & ordm; & sup1; + (- Mn) & sup2; & ordm; & sup1; & sup1 During the national day, a shopping mall will offer preferential treatment to customers. The regulations are as follows: if a purchase does not exceed 200 yuan (including 200 yuan), 10% discount will be given according to the price; if a purchase exceeds 200 yuan but does not exceed 500 yuan (including 500 yuan), 20% discount will be given according to the price of all goods; if a purchase exceeds 500 yuan, 20% discount will be given except 500 yuan, If someone pays 162 yuan and 456 yuan respectively for two purchases, how much money can he save if he buys the same goods together? Sorry, I have the wrong number. Please forgive me a²-（x+y+mn）a+x²º¹¹+y²º¹¹+（-mn）²º¹¹

If x and y are opposite to each other, m and N are reciprocal to each other, | a | = 2, find a & sup2; - (x + y + Mn) a + X & sup2; & ordm; & sup1; & sup1; + (- Mn) & sup2 If x and y are opposite to each other, m and N are reciprocal to each other, | a | = 2 Find the value of a & sup2; - (x + y + Mn) a + X & sup2; & ordm; & sup1; + (- Mn) & sup2; & ordm; & sup1; & sup1 During the national day, a shopping mall will offer preferential treatment to customers. The regulations are as follows: if a purchase does not exceed 200 yuan (including 200 yuan), 10% discount will be given according to the price; if a purchase exceeds 200 yuan but does not exceed 500 yuan (including 500 yuan), 20% discount will be given according to the price of all goods; if a purchase exceeds 500 yuan, 20% discount will be given except 500 yuan, If someone pays 162 yuan and 456 yuan respectively for two purchases, how much money can he save if he buys the same goods together? Sorry, I have the wrong number. Please forgive me a²-（x+y+mn）a+x²º¹¹+y²º¹¹+（-mn）²º¹¹

x. Y is opposite to each other, x + y = 0, that is y = - X,
m. N is reciprocal, Mn = 1
|a|=2, a²=4,
Substituting into the original formula, we get the following result:
4-（0+1）*a+x²º¹¹+(-x)²º¹¹+（-1）²º¹¹
=4-a+x²º¹¹-x²º¹¹-1
=4-a-1
=3-a,
|If a | = 2, then a = 2 or a = - 2,
The original formula = 1 or 5