已知函数y=2x+3x+1y = 2^x + 3x + 1y=2x+3x+1,则dy=dy=dy=( ).
(A)2x+32^x + 32x+3
(B)(2xln2+3)dx(\dfrac{2^x}{\ln2}+3)dx(ln22x+3)dx
(C)(2xln2+3)dx(2^x \ln2 + 3)dx(2xln2+3)dx
(D)2xln2+32^x \ln2 + 32xln2+3
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