Question

函數(shù)y=-xcosx的部分圖象是(    )

Answer 1

答案：D

解析：由函數(shù)y=-xcosx是奇函數(shù)，知圖象關(guān)于原點(diǎn)對(duì)稱.?又由當(dāng)x∈0, ]時(shí)，cosx≥0,有-xcosx≤0,?當(dāng)x∈-,0]時(shí)，cosx≥0,有-xcosx≥0. ∴應(yīng)選D.