(1)x2-9y2,
=x2-(3y)2,
=(x-3y)(x+3y);
(2)(a+b)2-6(a+b)+9,
=(a+b)2-6(a+b)+32,
=(a+b-3)2;
(3)x4-9x2,
=x2(x2-9),
=x2(x-3)(x+3);
(4)-3x3+6x2y-3xy2,
=-3x(x2-2xy+y2),
=-3x(x-y)2;
(5)2x(a-b)-(b-a),
=2x(a-b)+(a-b),
=(a-b)(2x-1).
因式分解 (1)x2-9y2 (2)(a+b)2-6(a+b)+9 (3)x4-9x2 (4)-3x3+6x2y-3xy2 (5)2x(a-b)-(b-a)
因式分解
(1)x2-9y2
(2)(a+b)2-6(a+b)+9
(3)x4-9x2
(4)-3x3+6x2y-3xy2
(5)2x(a-b)-(b-a)
(1)x2-9y2
(2)(a+b)2-6(a+b)+9
(3)x4-9x2
(4)-3x3+6x2y-3xy2
(5)2x(a-b)-(b-a)
数学人气:247 ℃时间:2019-11-05 03:34:27
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