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Question

Tìm các số nguyên a sao cho

a) 7/4<a/8<3  b)2/3<a-1/6<8/9  c)12/9<4/a<8/3

Dang Tung · Accepted Answer

a) $\dfrac{7}{4}< \dfrac{a}{8}< 3\ =>\dfrac{7}{4}.8< a< 3.8\ =>14< a< 24\ =>a\in\left\{15;16;17;...;23\right\}$ b) $\dfrac{2}{3}< \dfrac{a-1}{6}< \dfrac{8}{9}\ =>\dfrac{2}{3}.6< a-1< \dfrac{8}{9}.6\ =>4< a-1< \dfrac{16}{3}\ =>4+1< a< \dfrac{16}{3}+1\ =>5< a< \dfrac{19}{3}\ =>a=6$ b) $\dfrac{2}{3}< a-\dfrac{1}{6}< \dfrac{8}{9}\ =>\dfrac{2}{3}+\dfrac{1}{6}< a< \dfrac{8}{9}+\dfrac{1}{6}\ =>\dfrac{5}{6}< a< \dfrac{19}{18}\ =>a=1$ c) $\dfrac{12}{9}< \dfrac{4}{a}< \dfrac{8}{3}\ =>\dfrac{24}{18}< \dfrac{24}{6a}< \dfrac{24}{9}\ =>9< 6a< 18\ =>\dfrac{9}{6}< a< \dfrac{18}{6}\ =>1,5< a< 3\ =>a=2$Câu trả lời: a) $\dfrac{7}{4}< \dfrac{a}{8}< 3\ =>\dfrac{7}{4}.8< a< 3.8\ =>14< a< 24\ =>a\in\left\{15;16;17;...;23\right\}$ b) $\dfrac{2}{3}< \dfrac{a-1}{6}< \dfrac{8}{9}\ =>\dfrac{2}{3}.6< a-1< \dfrac{8}{9}.6\ =>4< a-1< \dfrac{16}{3}\ =>4+1< a< \dfrac{16}{3}+1\ =>5< a< \dfrac{19}{3}\ =>a=6$ b) $\dfrac{2}{3}< a-\dfrac{1}{6}< \dfrac{8}{9}\ =>\dfrac{2}{3}+\dfrac{1}{6}< a< \dfrac{8}{9}+\dfrac{1}{6}\ =>\dfrac{5}{6}< a< \dfrac{19}{18}\ =>a=1$ c) $\dfrac{12}{9}< \dfrac{4}{a}< \dfrac{8}{3}\ =>\dfrac{24}{18}< \dfrac{24}{6a}< \dfrac{24}{9}\ =>9< 6a< 18\ =>\dfrac{9}{6}< a< \dfrac{18}{6}\ =>1,5< a< 3\ =>a=2$

10	3	4	7	8	11	12	4	7	8
12	4	7	8	10	12	8	7	10	12
6	6	8	8	12	11	10	12	11	10
6	7	10	5	8	7	8	9	7	9
6	7	6	9	7	5	12	4	5	12

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Tài nguyên

Ứng dụng mobile

10	3	4	7	8	11	12	4	7	8
12	4	7	8	10	12	8	7	10	12
6	6	8	8	12	11	10	12	11	10
6	7	10	5	8	7	8	9	7	9
6	7	6	9	7	5	12	4	5	12

Giá trị (x)	1	2	3	4	5	6	7	8	9	10
Tần số (n)	1	1	4	3	4	4	3	3	3	1

10	3	4	7	8	11	12	4	7	8
12	4	7	8	10	12	8	7	10	12
6	6	8	8	12	11	10	12	11	10
6	7	10	5	8	7	8	9	7	9
6	7	6	9	7	5	12	4	5	12

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10	3	4	7	8	11	12	4	7	8
12	4	7	8	10	12	8	7	10	12
6	6	8	8	12	11	10	12	11	10
6	7	10	5	8	7	8	9	7	9
6	7	6	9	7	5	12	4	5	12