计算:(X-Y+9)(X+Y+9)
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计算:(X-Y+9)(X+Y+9)计算:(X-Y+9)(X+Y+9)计算:(X-Y+9)(X+Y+9)(X-Y+9)(X+Y+9)=[(x+9)-y][(x+9)+y]=(x+9)^2-y^2=x^2
计算:(X-Y+9)(X+Y+9)
计算:(X-Y+9)(X+Y+9)
计算:(X-Y+9)(X+Y+9)
(X-Y+9)(X+Y+9)=[(x+9)-y][(x+9)+y]=(x+9)^2-y^2=x^2+18x+81-y^2
计算:(X-Y+9)(X+Y+9)
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