4.因式分解：x²-25=____.5.因式分解：a³-ab²=____.6..将下列多项式因式分解.①m²-9n²；②ab³-4ab；③﹙5x-3﹚²-16x；④16x的4次方-1.

4.因式分解：x²-25=____.5.因式分解：a³-ab²=____.6..将下列多项式因式分解.①m²-9n²；②ab³-4ab；③﹙5x-3﹚²-16x；④16x的4次方-1.
4.因式分解：x²-25=____.5.因式分解：a³-ab²=____.
6..将下列多项式因式分解.①m²-9n²；②ab³-4ab；③﹙5x-3﹚²-16x；④16x的4次方-1.

4.因式分解：x²-25=____.5.因式分解：a³-ab²=____.6..将下列多项式因式分解.①m²-9n²；②ab³-4ab；③﹙5x-3﹚²-16x；④16x的4次方-1.
x²-25=(x+5)(x-5)
a³-ab²=a(a²-b²) = a(a+b)(a-b)
①
m²-9n²
= (m+3n)(m-3n)
②
ab³-4ab
= ab(b-4)
③
(5x-3)²-16x
= (5x+4√x-3)(5x-4√x-3)
④
16x^4-1
= (4x²+1)(4x²-1)
= (4x²+1)(2x+1)(2x-1)

x²-25=(x-5)(x+5)
a³-ab²=a(a+b)(a-b)
m²-9n²=(m+3n)(m-3n)
ab³-4ab=ab(b-2)(b+2)
﹙5x-3﹚²-16x=3*(x-3)(x-1)
16x的4次方-1.=(4x²-1)(4x²+1)=(2x+1)(2x-1)(4x²+1)

1.(x-5)(x 5)2.a(a b)(a-b)3.(m 3n)(m-3n)4.ab(b 2)(b-2)5.(5x-1)(5x-9)6.(4x² 1)(2x 1)(2x-1)