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Mathematics Senior High

赤で丸をしているところについて質問があります なぜこの考え方は誤りなのですか?

fm 32、 科式の人質と式の価の和男6) 、” ののののの 2 つの正の数*, を小数第 1 位で四捨五人ると, それぞれ6, 4 になるとい う。このとき, 3xー4y, xy の値の館囲を求めよ。 指針 四捨五入の問題は 不等式で考える。 1 ェの小数第 1 位を四搭五人すると 6 になる。 ゞの小数第 1 位を四搭五入すると 4 になる。一- ①⑪, ② を利用して, 3一4y, xy の値の範囲を求める。ここで, 前ページの例題 31 (5) と同 じように, 3メー4y は 3x圭(一4y) として考えるとよい。 4 7.58 基本事項 3] 基本 31 (gikUt4勝 差<ー〉の値の範囲 和 ヵ) と 本 。yは, それぞれ小数第 1 位で四捨五人人すると6, 1にな る数 であるから 5. DIOTNMSIRYCTe ① 35mVで4.5 。 ② ① の各辺に 3 を掛けて 16.5=3xく19.5 。 …… ③ ② の各辺に一4 を掛けて ー14=テー4リ>ー18 4負の数を掛けると, 不等3 すなわち ー18くー4yミー14 …… ④ の向きが変わる。 ③, ④ の各辺を加えて 16.5十(一18)く3x二(一4y)く19.5十(一13) <不等号に注意 | したがって ー1.5く3*ー4yく5.5 …… (ま) (検討参照)。 また,⑪⑩ の各辺に正の数 y を掛けて 5.5v=xy<6.5y 3 に 5.5 を掛けて 19.25ミ5.5y 43.5=y。yく1.5は②③から と 6.5yく29.25 <不等号に注意。

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English Senior High

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TPidgim Emgish Wiar happcms win people necd to communicate but have no cemmon angnagef Youmay ja aken par in coavertions sak as tBiS er perhaps youve witmeswed on fmm a ore comfortablc distance. They gesturc. they talk with their hands and feet. and 一 somewhat surprisingly 一 they speak. as well. That is surprising becasse they really cannot hope tbat amyopc w山 undcrstand much morc than their moodLif hr or she camt undcrstand thr languagr_ But they go ahead and speak anyway. and we can understand bits and pieces of what they say by paying clow attcnGon to thc rrst of the communicstem A がggiz is a simplihied form of language dcvclopcd by speakkcrs who otherwise share no omon languamw This means oi course that pidgins begin in mmultiingual* stuations 一 where ai least two. and more likcly seweral languagcs cocxist. ( ) ). pidgins spring up in rading rmters or in areas umdcr industriabzation (including agricultursl industmahzation. tbat plantanion) They develop bere because the opportuniies for trade and work attractlarge mambers or people with diEernt native tongues Thc term pidgin dcvlopcd from apidgin pronumciatiop of busness: busncss Engish became pidgin English・ A pidgin in the technical snsc is a sort oflanguage scrving the meeds of a community. Thus a pidgn is not simply thc brokcn Engiish of a waiter in a ipreign restaurant (who spcaks his native language with his co-worikers). por is it an idiots verson ofa language. or a kind of inevitable deterioration* in tbe bands of barbarians*。 ( づ )。 robably the morc intelieeat and ambidoms people in s culpure who master the cpcrsy and couragw needed for the move to an industrial or market amea Somc pcopks gcl that pidgins smc wag becatsc cf the Best snd os way they py with hc structural patterns of their basc language。 In a scnsr.the charge is correct pidgins have no respect for the grammars of tbeir base angrages But 下i doesnt make pidgins wrong since he radical simphification we find in pidgins servcs a worthwisls gpal- communicahon。 Because ofits simple structure a pidgin is easier to learn than other languagcs_ By providing a means of communication in a community. it fac抽tates tbe integration* of newcomers who would have a much more dificult time larning a standard Europcan language_ Tinaly. mdgins rc a reahty whosc cxistcpce is pot bject to dkbate。 Tbcr re dozeps of dgins. many of which show no signs of dying out Since tey arisc sponiapeously wherever people need to talk. pidgins probably represcnt the primative communication system out of which our more respected modern languages dcveloped。 This fact alonc makes them wel orth our attenton aped tom umeaer rax 3 cawos pe 23rの4 ne Os Se tee Dame e Leezaet ras ea PT ーッー

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