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题目已知a、b、x、y∈R+,其中a、b为常数且a≠b,a/x+b/y=1, 求:u=x+y的最小值. 错解
The subject is known as a, b, x, y ∈ R+, where a, b are constants and a ≠ b, a/x + b/y = 1, find: u = the minimum value of x + y.