.已知|x-3|+1/2×根号3-x=y-4,则x+y的最小值是?
问题描述：
.已知|x-3|+1/2×根号3-x=y-4,则x+y的最小值是?
答
︱x-3︱+1/2 √(3-x) = y - 43 - x > = 0 ==> x 3 - x + 1/2 √(3-x) = y - 4==> - x + 1/2 √(3-x) = y - 7==> x + y = 7 + 1/2 √(3-x) > = 7当 x = 3 时,取最小值 7.所以 x+...