5a²-15a (x-3y)²-(x+y)²因式分解.
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5a²-15a (x-3y)²-(x+y)²因式分解.
5a²-15a
(x-3y)²-(x+y)²
因式分解.
5a²-15a (x-3y)²-(x+y)²因式分解.
(x-3y)²-(x+y)²
=x²-6xy+9y²-x²-2xy-y²
=8y²-8xy
1)5a^2-15a =5a(a-3)
2)(x-3y)^2-(x+y)^2=(x-3y+x+y)(x-3y-x-y)=(2x-2y)(-4y)=-8y(x-y)
原式=5*(a的平方-3a)
原式=10y的平方-4xy
5a²-15a (x-3y)²-(x+y)²因式分解.
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