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英語 高校生

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次の半を本んで。 前いに苦えときい 務和Bahamtine ha ived in he North msnd or New Ziand nnce he mored here mem Pogieni BeHentne invied s group or Rehermen 1964 to take 。 oet em direter or he Devermisy cr Auokisnds Marine Laboratop in 19655 laboratary end told therm about his dee for areeenii ea to faing A large pert of he wea cf the coawt of the North iuiand sms to bs kept fes 6 』 buman aceiit Thmt meant no Rahing at all Halrof them emi dher halraaid。 Weml kml yo proble emls mw Theee ame Rhermen。 hower are nw some of the strongest uppoers of the reeeme Ye entualy transrmed pubh opinion were the chanees that had happened under the yaler PRip jad atmost dtiappeared becmuse tbere were too many Yaes urehins eating ・Snsppem weoshy ee smd he number ot eeel rewerve topped。 he bulance inmediatdly begwn to returm to pormal Wi Blnty ef spapperms around the number of ees uhins dropped Fiahermen have also benefnei om roorwes success。 becauae many snappens move out of the reserve into areas where the Raherrmet jean catch them。 Mihons or fi ees richer jraen urchins。 but they were being caught im lenge numbers by fehermem urchinw hed incmeased 。dramaticahy sa s result。 Wihen Rahing in the behween anappers and se urehine cgm 。8GR oet of the rmeme es nel aking the eroadieg でGiven tme nccess of the North land resere。 one might 。assume that there would have been s Japid ineewe in the number cf reweres where no fhing was allowed. Thene wasntt Am application for another reseme cf the Norih Iak land was refvwed。 Preseure fom sport Bahermen yas the reason。 While most people understood why commerdisl 5ahing shonid be 。prohibted ms eoemre。 many fl that sport fhing should be permitted. Few reahized that just catching one er no fh for fn on the weekends could cuse serious damage to the marine enwironment In Ri eeause most sport fhermen try to cmtdh the same one or two kinds of popular fnh。 they can eduee the number of thewe fah almost as much as commercial 5ahing can、 Allowing sport fhing. in areaerve js Hike having a Hibrary and allowing people to kep the most popular booka Tn the 1980s Ballantine traveled around New Zealand teaching dlsses about marine rmaemes Saral mall groope 。emerged ss a remnlt each working to set up manine maemes Studenls ae high echood wanted (6 wtabhih s reeerve in their lal harbor TL took them fourteen Yeart et ie 7hey hedd publie meetngw and raied money Pch gradvating dss paaaed the Ob Ch ounger atnden。 and fnay im 2005 he Wihangwrei Hartour AIanne Ressrre beeame s TedRty」 (8) reeerve: 人 kalp 大人水村 swe uthins:ウニ snapperw:フェアイ科の人

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数学 高校生

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ー smswme| @@⑥の④! 0一3 を満たすとき, 共役複素数の性質を利用 | の の c, 9は実数とする 3次方 * 程式 Zx?十px?上cx十の三0 が虚数解 ぐをもつとき, 共役複素数 も解にもつことを示せ。 | ーーやにもここだは 』 IART LUTTON 同の共役乏数を考える ーー四 1) 共役複素数の性質を利用してをと< 際 るとるの式を 2 つ作る。々とるの連立方程 (2) *ニoc が方程式 7⑦=0 の解 呈 7(の=0 dj (0) 3<十2g=ニ10一37 。 …… ① 四 ⑩ の両辺の共役複素数を考えると 語10=32 ようて 3ヌ+2 3< 2王10十3 | 共役系数の性質を利用 3のchウーI0生37 …:: @② 8を複素数とすると X3一の②X2 からる| 10154 ⑩X3一②X2 から < を消去して 5zニ10-15: ーー ゆえに タニ23 計入る ⑫⑰ 3 次方程式 zz*十cz*十cr十のー0 が虚数解 ニッ をもつ | で*ーc が解 っ から go?二5g2二co十dニ0 が成り立つ。 でを代入すると成り立つ。 還 両辺の共役複素数を考えると zo二5c*二cgの=0 よって gg"+69?+cg+9=0 ゆえに ggo?二cg二のー 9 で2 6 cdは実数であ すなわち 、g(@の"上("上co+9=0。 こ 9 これは, ァニ@ が 次方程式 cc*二6r*二cdー0 の解で あることを示している。 よって, 3 次方程式 cz*十0x*十cx填dー0 が虚数解 ニg をもつとき, 共役複素数 xニw も解にもつ。

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