1、1 知识精华 Concentration 1Conception 1.2.0 3.11(1)15(2)48(3)449(4)5(5)0Exercise(1)84(2)21(3)253(4)227(5)02B Exercise1D2D31.471;32232.DExercise 1.B 2.B 3.D 4C 2Conception 1.(1)abba(2)(ab)ca(bc)(3)ab+aca(b+c)2.(1)(2)04(1)820 315 2 Exercise（1）32210 3741245(1)33510(2)24(3)60(4)18992Exercise(1)1270250 3303Co
2、nception 1.2.03.600ab，ab0ab0 00ab，ab0ab0 00ab，ab0ab0 00ab，ab0ab0 Exercise 0ab+0baa0,b0.0ab+0baab|a|b.0ab+0baab|a|b.3 7(1)6(2)3(3)0Exercise(1)5(2)2(3)1038(1)180(2)256Exercise(1)32(2)17(3)1(4)149(1)117313()(48)12642422281813()(48)242424241()(48)242+=+=(2)11(370)()0.2524.5+(25%)(5)42370 0.250.25 24.50.25 5.50.25 370(24.55.5)0.25 400100+=+=+=4(3)15(3)3()(8 11)2366(3)3(3)(3)256(3)(32)51(3)()535 =(4)98Exercise(1)15(2)112(3)32(4)28
