【導(dǎo)讀】(1)1898?(2)50513483231??5240??2020411253??(1)5040?(2)ab6523?(3)322baa??61211?613233223??321?253?(2)ab?4210?10321032??)35(3)51(5???xx. 5:解不等式:xx181)83(21???12)12)(12()12(1211????????;23)23)(23(23231???????25)25)(25(25251???????。671?17231?的值;nn??11. (n為正整數(shù))的值。21(248???2.__________)21(2??3.ba42?=________. 5?yxyx??11x??的根是。:12()52x??x,41(4)23(????(2)2312)2009(0?????(3)3116943aa?(4)21962. 34xxxx??234535axaaxxa?25xyxy?(1)(548+12-76)÷3;122?+2(2-1)0;+ab)÷23???????