分解因式(1)4x²-1/4y² (2)ax²-ay²(3)x²y-9y
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分解因式(1)4x²-1/4y² (2)ax²-ay²(3)x²y-9y
分解因式(1)4x²-1/4y² (2)ax²-ay²(3)x²y-9y
分解因式(1)4x²-1/4y² (2)ax²-ay²(3)x²y-9y
(1)4x²-1/4y²
=1/4(16x²-y²)
=1/4(4x+y)(4x-y)
(2)ax²-ay²
=a(x²-y²)
=a(x+y)(x-y)
(3)x²y-9y
=y(x²-9)
=y(x+3)(x-3)
(1)4x²-1/4y²
=(2x +1/2y ) (2x -1/2y )
(2)ax²-ay²
= a (x+y ) (x-y)
(3)x²y-9y
= y ( x+3 ) (x-3 )