1.若x²+y²＝1,则（y-2）/(x-1) 的最小值是____；x/3 + y/4 的最大值是____3/4 和 5/122.已知函数y=（ax+b）/（x²+1）的值域为[-1,4],求常数a,b的值答案是a=4 b=3 或a=-4 b=3

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