(1)2xy²+x²y-xy=xy*________(2)a的n次方+a的n+2次方+a的2n次方=a的n次方=________

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(1)2xy²+x²y-xy=xy*________(2)a的n次方+a的n+2次方+a的2n次方=a的n次方=________
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(1)2xy²+x²y-xy=xy*________(2)a的n次方+a的n+2次方+a的2n次方=a的n次方=________
(1)2xy²+x²y-xy=xy*________(2)a的n次方+a的n+2次方+a的2n次方=a的n次方=________

(1)2xy²+x²y-xy=xy*________(2)a的n次方+a的n+2次方+a的2n次方=a的n次方=________
(1)2xy²+x²y-xy=xy*(2y+x-1)
(2)a的n次方+a的n+2次方+a的2n次方=a的n次方(1+a²+2的n次方)