一只鬧鐘整點(diǎn)報(bào)時(shí)2時(shí)就敲2下每敲1下隔1秒到1（1右-1）×1=d×1=d（秒）答：敲完要d秒．2，從1時(shí)到1時(shí)半鐘面上時(shí)針旋轉(zhuǎn)了分針轉(zhuǎn)了分別是15和180，這么容易？分針180時(shí)針153，已知代數(shù)式x2pxq當(dāng)x1時(shí)5當(dāng)x3時(shí)它的值是3x^2+px+q當(dāng)X=-1時(shí)1-p+q=-5q-p=-6那么X=3時(shí)9+3p+q=33p+q=-6q-p=-63p+q=-6解得p=0q=-64，集合M01Nyx2y21x屬于N則MN的關(guān)系是在N中,當(dāng)x=0時(shí),y=1或-1,當(dāng)x=1或-1時(shí),y=0.故M真包含于N....