3解:(I)当a=1b=-1时,A当,·。<,三2x,x<-1,)=(f(x)=|x-1|+x+1|={2,-1≤x≤1,给0价:(2x,x>1,不浮1(2分示f(x)>3等价于{2-2x>3,12>3,心<-1,1≤x≤1,或x>1,或2x>3解得x>3或x<3A∴不等式f(x)>3的解集为3>或x32(5分)(Ⅱ)由绝对值三角形不等式可知|x-aH+x=b|≥a-b|=2为(7分)平最入a-b=2,⊙将(7分)平当且仅当(x-a)(x-b)≤0时等号成立0=2∵a>b,a=b+2,a2+b2=(b+2)2+b2=2(b+1)2+2≥2,“N2b2+4b+4异,康(9分)当且仅当b=-1,a=1时等号成立(2a2+b2的最小值为2.(10分)中

短文改错This evening my father was at a grocery store, where is often crowded. A woman next to with him hadwhiclocked her keys and her baby in her vehicle. Several store clerks had tried to help her but in vain, and he did notshehave the money for a tow truck(E4). My father called a friend of his who is the tow truck driver. It wasalate in the evening and he were having dinner with his family. Therefore, he immediately agreed a drive to helpwasHowevertothe woman. My father then gave the driver twenty dollars and all ended good. The woman was quite moving andwemovednearly burst into teartears

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