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Treân taäp hôïp soá thöïc, khi so saùnh hai soá a vaø b xaûy ramột trong ba tröôøng hôïp:
Treân taäp hôïp soá thöïc, khi so saùnh hai soá a vaø b thìxaûy ra nhöõng tröôøng hôïp naøo ?
Soá a lôùn hôn soá b, kí hieäu a > b.
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? Khi biÓu diÔn hai sè thùc trªn trôc sè (vÏ theo ph- ¬ngn»m ngang) em có nhận xét gì về vÞ trÝ c¸c ®iÓm biÓudiÔn hai sè ®ã?
Điểm biểu diễn số nhỏ hơ n ở bên trái điểm biểu
diễn số lớ n hơ n
-2 -1,3 30 2
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I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
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Ví duï: Vôùi moïi x ta coù x2 ≥ 0Neáu c laø soá khoâng aâm thì c ≥ 0
á â ù á
a = b a < b a > b
a ≤ bNoùi goïn laø: a nhoû hôn hoaëc baèng b
Ví duï: Vôùi moïi x ta coù - x2
≤ 0Neáu y khoâng lôùn hôn 3 thì y ≤ 3
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Bài 1. Dùng một trong các dấu <, , >, để thểhiện các câu nói sau:
5,07
Câu Nội dung Viết kí hiệu
a -7 bé hơ n 0,5
3
1
2
1
6a
2
1
3
1
b12
a ơ n o c ng
c lớ n hơ n
d 12 không bé hơ n số b
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v à a gọi là vế trái, b l à vế phải củabất đẳng thứ c.
Baát ñaúng thöùc: 8 > -5 + b
Veá traùi laø:
Veá phaûi laø:
8
-5 + b
Ví dụ:
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I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
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Cho bieát baát ñaúng thöùc bieåu dieãn moái quan heä giöõa (-4)vaø 2.
0-5 -4 -1-2-3 61 2 543
- 4 < 2
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I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
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a) Khi coäng -3 vaøo caû hai veá cuûa baát ñaúng thöùc -4 < 2thì ñöôïc baát ñaúng thöùc naøo ?
2
- - -
b) Döï ñoaùn keát quaû: Khi coäng soá c vaøo caû hai veá cuûabaát ñaúng thöùc -4 < 2 thì ñöôïc baát ñaúng thöùc naøo ?
2
- 4 + c < 2 + c
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Biết a < b => a + c < b + c (tính chất)Biết a + c < b + c
=> a + c + (-c) < b + c + (-c) (tính chất)
=> a < b
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I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, if you can print from a windows application you can use pdfMachine.
I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, if you can print from a windows application you can use pdfMachine.
thông vớ i nền trắng, số 20màu đen, viền đỏ (xem hình
minh hoạ) cho biết vận tốc tối
đa mà các phươ ng tiện giao
thông đượ c đi trên quãng
đườ ng có biển quy định là
a > 20 a ≥ 20a ≤ 20 a < 20
20km/h. Một ôtô đi trên
đườ ng đó có vận tốc là a
(km/h) thì a phải thoả mãn
điều kiện nào trong các điều
kiện sau:
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I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, if you can print from a windows application you can use pdfMachine.
I s a pdf wr i t e r tha t produces qua l i ty PDF f i les wi th ease!
Produce quality PDF files in seconds and preserve the integrity of your original documents. Compatible acrossnearly all Windows platforms, if you can print from a windows application you can use pdfMachine.