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若f(x)dx=1,g(x)dx=-3,则[2f(x)+g(x)]dx=(  )A.2            ...

若f(x)dx=1,g(x)dx=-3,则[2f(x)+g(x)]dx=(  )A.2            ...

2019-08-14
问题详情:若f(x)dx=1,g(x)dx=-3,则[2f(x)+g(x)]dx=()A.2                             B.-3C.-1                           D.4【回答】C[[2f(x)+g(x)]dx=2f(x)dx+g(x)dx=2×...