因式分解
(1)2x³-8x(2)ax²y+axy²(3)16x²y²z²-9(4)-4m³+16m²...
(1)2x³-8x(2)ax²y+axy² (3)16x²y²z²-9 (4)-4m³+16m²-26 (5)a³-2a²+a
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(1)2x³-8x
=2x(x²-4)
=2x(x+2)(x-2)
(2)ax²y+axy²
=axy(x+y)
(3)16x²y²z²-9=(4xyz+3)(4xyz-3)
(4)-4m³+16m²-26 这个不对
(5)a³-2a²+a
=a(a²-2a+1)
=a(a-1)²
=2x(x²-4)
=2x(x+2)(x-2)
(2)ax²y+axy²
=axy(x+y)
(3)16x²y²z²-9=(4xyz+3)(4xyz-3)
(4)-4m³+16m²-26 这个不对
(5)a³-2a²+a
=a(a²-2a+1)
=a(a-1)²
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1)2x³-8x
= 2x (x^2 - 4 )
= 2x (x+2 ) (x-2 )
(2)ax²y+axy²
= axy (x+y )
(3)16x²y²z²-9
= (4xyz - 3 )(4xyz +3 )
(4)-4m³+16m²-26
= -2 ( 2m^2 -8m + 13 )
(5)a³-2a²+a
= a (a^2 -2a +1 )
= a (a-1 ) ^ 2
= 2x (x^2 - 4 )
= 2x (x+2 ) (x-2 )
(2)ax²y+axy²
= axy (x+y )
(3)16x²y²z²-9
= (4xyz - 3 )(4xyz +3 )
(4)-4m³+16m²-26
= -2 ( 2m^2 -8m + 13 )
(5)a³-2a²+a
= a (a^2 -2a +1 )
= a (a-1 ) ^ 2
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