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原式=x²(x+y)-y²(x+y)
=(x+y)(x²-y²)
=(x+y)²(x-y)
原式=(5m²+3n²+3m²+5n²)(5m²+3n²-3m²-5n²)
=(8m²+8n²)(2m²-2n²)
=16(m²+n²)(m+n)(m-n)
=(x+y)(x²-y²)
=(x+y)²(x-y)
原式=(5m²+3n²+3m²+5n²)(5m²+3n²-3m²-5n²)
=(8m²+8n²)(2m²-2n²)
=16(m²+n²)(m+n)(m-n)
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(1)x³+x²y-xy²-y³
=x²(x+y)-y²(x+y)
=(x+y)(x²-y²)
=(x+y)(x+y)(x-y)
=(x+y)²(x-y)
(2)(5m²+3n²)²-(3m² +5n²)²
=[(5m²+3n²)+(3m² +5n²)][(5m²+3n²)-(3m² +5n²)]
=(8m²+8n²)(2m²-2n²)
=16(m²+n²)(m+n)(m-n)
=x²(x+y)-y²(x+y)
=(x+y)(x²-y²)
=(x+y)(x+y)(x-y)
=(x+y)²(x-y)
(2)(5m²+3n²)²-(3m² +5n²)²
=[(5m²+3n²)+(3m² +5n²)][(5m²+3n²)-(3m² +5n²)]
=(8m²+8n²)(2m²-2n²)
=16(m²+n²)(m+n)(m-n)
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=(x+y)²(x-y)
=16(m²+n²)(m+n)(m-n)
=16(m²+n²)(m+n)(m-n)
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