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(1)(aB-B2)÷; (2)()÷
(3)(1+)÷(1+); (4)()·
(1)52×54;(2)a3×a4×(-a)5;(3)(x-y)3×(y-x)4.
(1)()()+()0; (2)-42+∣∣-(2002-)0+;
(3)-()0+(-1)2002 (4)()++3-2;
(5)()2-(2-)-1+;(6)()()-().