把下列各式分解因式:(1)4a2bc-8ab+32b2;(2)x(a-b)(b-c)-y(b-a)(b-c);(3)x4-81;(4)a2
把下列各式分解因式:(1)4a2bc-8ab+32b2;(2)x(a-b)(b-c)-y(b-a)(b-c);(3)x4-81;(4)a24-ab+b2;(5)2x3-1...
把下列各式分解因式:(1)4a2bc-8ab+32b2;(2)x(a-b)(b-c)-y(b-a)(b-c);(3)x4-81;(4)a24-ab+b2;(5)2x3-18xy2;(6)-y3-14y+y2.
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(1)4a2bc-8ab+32b2=4b(a2c-2a+8b);
(2)x(a-b)(b-c)-y(b-a)(b-c),
=x(a-b)(b-c)+y(a-b)(b-c),
=(a-b)(b-c)(x+y);
(3)x4-81,
=(x2+9)(x2-9),
=(x2+9)(x+3)(x-3);
(4)
-ab+b2=(
-b)2;
(5)2x3-18xy2,
=2x(x2-9y2),
=2x(x+3y)(x-3y);
(6)-y3-
y+y2,
=-y(y2-y+
),
=-y(y-
)2.
(2)x(a-b)(b-c)-y(b-a)(b-c),
=x(a-b)(b-c)+y(a-b)(b-c),
=(a-b)(b-c)(x+y);
(3)x4-81,
=(x2+9)(x2-9),
=(x2+9)(x+3)(x-3);
(4)
a2 |
4 |
a |
2 |
(5)2x3-18xy2,
=2x(x2-9y2),
=2x(x+3y)(x-3y);
(6)-y3-
1 |
4 |
=-y(y2-y+
1 |
4 |
=-y(y-
1 |
2 |
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