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Translator: Hong Yun Lim (임홍윤) 
부등식 강의에 온걸환영합니다

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대수의 부등식이라고해도될거갔네요

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이제 시작해보죠

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만약내가 물어본다면

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x>5 맞죠?

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따라서 x 는 5.01 도되고 5.5도되고 백만도될수있는거에요

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4나 3 0 아니면 -8은 될수가없죠

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이해할려면

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수직선에 그러봐요

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여기 수직선이있고요

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여기가 5라하고, x 는 5랑 같을수가없어요

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여기에 커다란 동그라미를그리고 색을칠해요

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여기있는값들이 x 가될수있는것들이에요

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x 는 5.000001 이될수있어요

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5보다 아주조금작조

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조건을만족시키죠 ?

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조건을만족시키는 수들을적어볼게요

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6되고 10도 되고

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100도되네요

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자이제 제가 나누거나 곱했으면

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양쪽다 식이나오겠죠

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-1 어떻게됫나보면

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-x 와 -5 의관계를봐보조

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내가 말한것처럼

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-5보다 크거나작나요?

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6은 x 가될수있죠

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-6은 -5 작죠

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맞죠?

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수직석을다시그리면

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-5 s는여기있오 동그라미를그려요

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왜냐하면 x는-5가안될거니까요

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그렇게 정했어요

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크거나작으면

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6은 x 가되고 -6 은여기있죠?

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-6

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-6은 -5 보다작아요

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-10 이나 -100 이나 -1000000 맞죠

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-x 은 -5보다작을수있어요

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이걸기억해야해요

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부등식을할때는

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이렇게될수있어요

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A> 아니면 a< = 이랑 했가리면안되요

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다른점은

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음수로 나뉘거다 곱해지면

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부호가 바껴요

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이걸기억해야해요

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이걸기억하게 문제를 좀풀어보죠