計(jì)算.
(1)
(-12a2b2c)-(-abc2)2;
(2)
(-a2)-(-2ab)+3a2(ab-b-1);
(3)
8x2-5x(4y-x)+4x(-4x-y);
(4)(3a
2-2b
2)(a
2+b
2).
(1)
(-12a2b2c)•(-abc2)2=(12a
2b
2c)•
a
2b
2c
4
=
a
4b
4c
5;
(2)
(-a2)•(-2ab)+3a2(ab-b-1)=2a
3b+3a
3b-a
2b-3a
2
=5a
3b-a
2b-3a
2;
(3)
8x2-5x(4y-x)+4x(-4x-y)=8x
2-20xy+5x
2-16x
2-10xy
=13x
2-30xy-16x
2;
(4)(3a
2-2b
2)(a
2+b
2)
=3a
4+3a
2b
2-2a
2b
2-2b
4
=3a
4+a
2b
2-2b
4.
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