化简:(1)2a2b+3a2b?12a2b(2)8a-a3+a2+4a3-a2-7a-6(3)(8a2b-5ab2)-2(3a2b-4ab2)(4)2(a2-ab

化简:(1)2a2b+3a2b?12a2b(2)8a-a3+a2+4a3-a2-7a-6(3)(8a2b-5ab2)-2(3a2b-4ab2)(4)2(a2-ab)-4(2a2-3ab)-2[a2-(2a2-ab+b2)].

(1)原式=(2+3-
1
2
)a2b
=
9
2
a2b;

(2)原式=8a-a3+a2+4a3-a2-7a-6
=(4-1)a3+(1-1)a2+(8-7)a-6
=3a3+a-6;

(3)原式=8a2b-5ab2-6a2b+8ab2
=(8-6)a2b+(8-5)ab2
=2a2b+3ab2

(4)原式=2a2-2ab-8a2+12ab-2a2+2(2a2-ab+b2
=2a2-2ab-8a2+12ab-2a2+4a2-2ab+2b2
=-4a2+2b2+8ab.
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