x与y互为相反数,当a=±1时,求a²-(x+y)a+(x+y)²的值?现在就要.

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x与y互为相反数,当a=±1时,求a²-(x+y)a+(x+y)²的值?现在就要.x与y互为相反数,当a=±1时,求a²-(x+y)a+(x+y)²的值?现在就

x与y互为相反数,当a=±1时,求a²-(x+y)a+(x+y)²的值?现在就要.
x与y互为相反数,当a=±1时,求a²-(x+y)a+(x+y)²的值?现在就要.

x与y互为相反数,当a=±1时,求a²-(x+y)a+(x+y)²的值?现在就要.
x与y互为相反数
x+y=0
a²-(x+y)a+(x+y)²=1