x(4x+3y)-(2x+y)(2x-y)
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x(4x+3y)-(2x+y)(2x-y)
x(4x+3y)-(2x+y)(2x-y)
x(4x+3y)-(2x+y)(2x-y)
手表
=4x2+3xy-4x2+y2
=3xy+y2