A . df（x）dx=f（x）B . df（x）dx=f（x）dxC . （d／dx）f（x）dx=f（x）+cD . （d／dx）f（x）dx=f（x）dx
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f（x）dx=f（x）f（x）dx=f（x）dxf（x）dx=f（x）+cf（x）dx=f（x）dxf（x）dx=f（x）f（x）dx=f（x）dxf（x）dx=f（x）+cf（x）dx=f（x）dx