题干

若有理数a,b满足ab<0,则
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的值为____
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同类题4

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    卢渊,性温雅寡欲,有祖父之风,敦尚学业,闺门和睦。袭侯爵,拜主客令,典属国。迁秘书令、始平王师。以例降爵为伯。给事黄门侍郎,迁兼散骑常侍、秘书监、本州大中正。

    是时,高祖将立冯后,方集朝臣议之。高祖先谓渊曰:“卿意以为何如?”对曰:“此自古所慎,如臣愚意,宜更简卜。”高祖曰:“以先后之侄,朕意已定。”渊曰:“虽奉敕如此,然于臣。实有未尽。”及朝臣集议,执意如前。冯诞有盛宠,深以为恨,渊不以介怀。

    及车驾南伐,赵郡王干督关右诸军事,诏加渊使持节、安南将军为副,勒众七万将出子午。寻以萧赜死,停师。是时泾州羌叛,残破城邑,渊以步骑六千众号三万,徐行而进。未经三旬,贼众逃散,降者数万口,唯枭首恶,余悉不问。诏兼侍中。初,渊年十四,尝诣长安。将还,诸相饯送者五十余人,别于渭北。有相者扶风人王伯达曰诸君皆不如此卢郎虽位不副实然德声甚盛望逾公辅。后二十余年,当制命关右。愿不相忘,此行也。相者年过八十,诣军门请见,言叙平生。未几,拜仪曹尚书。高祖考课在位,降渊以王师守常侍、尚书,夺常侍禄一周。寻除豫州刺史,以母老固辞。

    寻遭母忧,高祖遣谒者诣宅宣慰。服阕,兼太尉长史。高祖南讨,又兼彭城王中军府长史。寻为徐州京兆王愉兼长史,赐绢百匹。愉既年少,事无巨细,多决于渊。渊以诚信御物,甚得东南民和。南徐州刺史沈陵密谋外叛,渊觉其萌渐,潜敕诸戍,微为之备。屡有表闻,朝廷不纳。陵果杀将佐,勒宿豫之众逃叛。滨淮诸戍,由备得全。陵在边历年,阴结既广,二州人情,成相扇惑。陵之余党,颇见执送,渊皆抚而赦之,惟归罪于陵,由是众心乃安。

    景明初,除秘书监。二年卒官,年四十八。赠安北将军、幽州刺史,复本爵固安伯,曰懿。

(选自《魏书·卢渊传》,有删节)

同类题5

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    The world always makes way for the dreamer

    When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall listening to Mr. Zigler1everyone's spirits up to the ceiling. I 2there feeling like l could do anything. When we got to the car, I turned to my father and said, "Dad, I want to3 people feel like that." My father asked me 4 I meant. "I want to be a motivational speaker just like Mr. Zigler." I replied. A(An)5  was born.

    Recently, I began seeking my dream of motivating others. 6  a four-year relationship with Fortune 100 Company 7as a sales-trainer and ending as a regional(地区的) sales manager, I left the company at the height of my8. Many people were9that I would leave after earning a six-figure income. And they wondered10I would risk everything for a dream.

    I made my 11 to start my own company and leave my worryingless position after12a regional sales meeting. The vice-president of our company made a13 that changed my life. He asked us, "If a god would offer you three wishes, what would they be?" After giving us a(an)14 to write down the three wishes, he then asked us, "Why do you need a 15 ?" I would never forget the power I felt at that moment. I realize that 16 I had accomplished in the past had prepared me for this moment. I was ready and didn't need a god's help to become a motivational speaker. A motivational speaker was17 .

    Having made that decision, I was immediately18 . One week after I gave notice, my husband was laid off from his job, and now we had no 19. But I held fast to my dream. The wonder really began to happen. In a short time my husband found a better job. And I was able to book several 20 engagements with new customers. I discovered the incredible power of dreams.