Toán Lớp 8: 225-4x mũ 2 -4xy-y mũ 2 mn giúp em nha
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Toán Lớp 8: 225-4x mũ 2 -4xy-y mũ 2 mn giúp em nha
Comments ( 2 )
=225-(4x^2+4xy+y^2)
=225-[(2x)^2+2.2x.y+y^2]
=225-(2x+y)^2
=15^2-(2x+y)^2
=(15-2x-y)(15+2x+y)