A.(3t+5)(t+1)t B.(6t+5)(t+1)/t C.(6t+5

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问题 A.(3t+5)(t+1)tB.(6t+5)(t+1)/tC.(6t+5)(t+1)tD.(3t+5)(t+1)/t

选项 A.(3t+5)(t+1)t
B.(6t+5)(t+1)/t
C.(6t+5)(t+1)t
D.(3t+5)(t+1)/t

答案 B

解析 本题采用参数方程求导法,dy/dx=yt′/xt′,即
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