[(x+2y)²]⁴·(x+2y)²

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[(x+2y)²]⁴·(x+2y)²[(x+2y)²]⁴·(x+2y)²[(x+2y)²]⁴·(x+2y)

[(x+2y)²]⁴·(x+2y)²
[(x+2y)²]⁴·(x+2y)²

[(x+2y)²]⁴·(x+2y)²
[(x+2y)²]⁴·(x+2y)²
=（X+2Y）^(2×4）×（X+2Y)^2
=(X+2Y)^8×（X+2Y)^2
=(X+2y)^(8+2)
=(X+2Y)^10