计算:(1)(x-2y)(x+3y)(2)(x-1)(x2-x+1)(3)(-2x+9y2)(13
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计算:
(1)(x-2y)(x+3y)
(2)(x-1)(x2-x+1)
(3)(-2x+9y2)(
(1)(x-2y)(x+3y)
(2)(x-1)(x2-x+1)
(3)(-2x+9y2)(
1 |
3 |
(1)(x-2y)(x+3y),
=x2+3xy-2xy-6y2,
=x2+xy-6y2;
(2)(x-1)(x2-x+1),
=x3-x2+x-x2+x-1,
=x3-2x2+2x-1;
(3)(-2x+9y2)(
1
3x2-5y),
=-
2
3x3+10xy+3x2y2-45y3;
(4)(2a2-1)(a-4)-(a2+3)(2a-5),
=2a3-8a2-a+4-(2a3-5a2+6a-15),
=2a3-8a2-a+4-2a3+5a2-6a+15,
=-3a2-7a+19.
=x2+3xy-2xy-6y2,
=x2+xy-6y2;
(2)(x-1)(x2-x+1),
=x3-x2+x-x2+x-1,
=x3-2x2+2x-1;
(3)(-2x+9y2)(
1
3x2-5y),
=-
2
3x3+10xy+3x2y2-45y3;
(4)(2a2-1)(a-4)-(a2+3)(2a-5),
=2a3-8a2-a+4-(2a3-5a2+6a-15),
=2a3-8a2-a+4-2a3+5a2-6a+15,
=-3a2-7a+19.
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