计算(x-2y+1)(x+2y+1)
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计算(x-2y+1)(x+2y+1)
计算(x-2y+1)(x+2y+1)
计算(x-2y+1)(x+2y+1)
原式=(x+1)^2-4y^2=x^2+2x+1-4y^2
原式=[(x-2y)+1][(x+2y)+1]
=[x^2-4y^2+1]
原式=(X+1-2Y)(X+1+2Y)=XX-4YY
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