f(x)=|x²+2x-3|=|(x+3)(x-1)|画下抛物线草图,在-3≤x≤1图象是与(x+3)(x-1)图象关于x轴对称,在x≥1或x≤-3,f(x))=|x²+2x-3|图象是与(x+3)(x-1)图象相同部分,所以f(x)=|x²+2x-3|=|(x+1)²-4|的增...