(X+2Y)^4—(X+2Y)^2
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![(X+2Y)^4—(X+2Y)^2](/uploads/image/z/1752605-53-5.jpg?t=%28X%2B2Y%29%5E4%E2%80%94%28X%2B2Y%29%5E2)
(X+2Y)^4—(X+2Y)^2
(X+2Y)^4—(X+2Y)^2
(X+2Y)^4—(X+2Y)^2
(X+2Y)^2((X+2Y)^2-1)==(X+2Y)^2(X+2Y+1)(X+2Y-1)
原式=(X+2Y)^2((X+2Y)^2-1)
=(X+2Y)^2(X+2Y+1)(X+2Y-1)
(X+2Y)^2((X+2Y)^2-1)=(X+2Y+1)(X+2Y-1)(X+2Y)^2
原式=(X+2Y)^2((X+2Y)^2-1)
=(X+2Y)^2(X+2Y+1)(X+2Y-1)