分解因式: a²+2a(b+c)+(b+c)²=___ 有步骤吗?
分解因式:(2x+y)²-(x+2y²)=____(m+n)²-4m(m+n)+4m²=_____m²-14m+49=_...
分解因式:(2x+y)² -(x+2y²)=____ (m+n)² - 4m(m+n)+4m² =_____ m²-14m+49=_____ a²+2a(b+c)+(b+c)²=_____ 有步骤吗?
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2x+y)²
-(x+2y²)
=4x^2+4xy+y^2-x^2-4xy-4y^2
=3x^2-3y^2
=3(x-y)(x+y)
(m+n)²
-
4m(m+n)+4m²
=m^2+2mn+n^2-4m^2-4mn+4m^2
=m^2-2mn+n^2
=(m-n)^2
m²-14m+49
=(m-7)^2
a²+2a(b+c)+(b+c)²
=a^2+2ab+2ac+b^2+2bc+c^2
=
(a+b+c)^2
-(x+2y²)
=4x^2+4xy+y^2-x^2-4xy-4y^2
=3x^2-3y^2
=3(x-y)(x+y)
(m+n)²
-
4m(m+n)+4m²
=m^2+2mn+n^2-4m^2-4mn+4m^2
=m^2-2mn+n^2
=(m-n)^2
m²-14m+49
=(m-7)^2
a²+2a(b+c)+(b+c)²
=a^2+2ab+2ac+b^2+2bc+c^2
=
(a+b+c)^2
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