摘要：计算: (1) -3xy·2xy (2) 3a2b·2ab·abc2 ·(-a2c)·6ab2c 2·(x+y)5 (5) (2×103)× (3×104)×(-3×105) 5·(xy)2·x3y (7) (-m3n)3·(-2m2n)4 (8) (2a2b3)3·(-3a2b)2·abc (9) (-3x2y)3·xyz·(-xy)2 2]2·(y-x)3 (11) anb2·(an+1·b4)2 (12) (-2sn+1)4·sn·t

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