• 2022-11-03
    设 [tex=9.643x1.214]D8xp7x4MNPrRew+5Zs3hrndFyx1lvHXPB0VD1iySpIY=[/tex] 有二阶连续导数, 证明 [tex=6.286x1.357]lBXXZYMMrxJ2+/5vAU9EveuCUGC7idFoCcnB5gP3/a9IlbGejySOBv8eGmnmz4sk[/tex]