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4xy-[(x²+5xy-y²芦锋)-(x²+3xy-2y²)]
=4xy-(x²+5xy-y²-x²蔽哗如-3xy+2y²宏启)
=4xy-(2xy+y²)
=4xy-2xy-y²
=2xy-y²
=y(2x-y)
=(-1)x(2x2+1)
=-5
=4xy-(x²+5xy-y²-x²蔽哗如-3xy+2y²宏启)
=4xy-(2xy+y²)
=4xy-2xy-y²
=2xy-y²
=y(2x-y)
=(-1)x(2x2+1)
=-5
参考资料: 梦想无是无非
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4xy-[(x²+5xy-y²侍态)-(x²+3xy-2y²)]
=4xy-(x²+5xy-y²老渗源喊团-x²-3xy+2y²)
=4xy-(2xy+y²)
=2xy-y²
=(2x-y)y
=(2x2+1)x(-1)
=-5
=4xy-(x²+5xy-y²老渗源喊团-x²-3xy+2y²)
=4xy-(2xy+y²)
=2xy-y²
=(2x-y)y
=(2x2+1)x(-1)
=-5
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