Tìm x thuộc Z, biết: a) 4 < x < 13/3 b) -4 < x < -15/4 c) -2 < x < -1 d) 0 < x<1/2 17/09/2021 Bởi Reese Tìm x thuộc Z, biết: a) 4 < x < 13/3 b) -4 < x < -15/4 c) -2 < x < -1 d) 0 < x<1/2
$\text { Đáp án: }$ ` a) ` ` 4 < x < 13/3 ` $\text { (đk: x ∈ Z) }$ ` => 4 < x < 4,33… ` ` => x ∈ ∅ ` ` b) ` ` –4 < x < –15/4 ` $\text { (đk: x ∈ Z) }$ ` => –4 < x < –3,75 ` ` => x ∈ ∅ ` ` c) ` ` –2 < x < –1 ` $\text { (đk: x ∈ Z) }$ ` => x ∈ ∅ ` ` d) ` ` 0 < x < 1/2 ` $\text { (đk: x ∈ Z) }$ ` => 0 < x < 0,5 ` ` => x ∈ ∅ ` Bình luận
a) `4 < x < 13/3` `=> x \in ∅` b) `-4 < x < -15/4` `=> x /in ∅` c) `-2 < x < -1` `=> x \in ∅` d) `0 < x < 1/2` `=> x \in ∅` Bình luận
$\text { Đáp án: }$
` a) `
` 4 < x < 13/3 ` $\text { (đk: x ∈ Z) }$
` => 4 < x < 4,33… `
` => x ∈ ∅ `
` b) `
` –4 < x < –15/4 ` $\text { (đk: x ∈ Z) }$
` => –4 < x < –3,75 `
` => x ∈ ∅ `
` c) `
` –2 < x < –1 ` $\text { (đk: x ∈ Z) }$
` => x ∈ ∅ `
` d) `
` 0 < x < 1/2 ` $\text { (đk: x ∈ Z) }$
` => 0 < x < 0,5 `
` => x ∈ ∅ `
a) `4 < x < 13/3`
`=> x \in ∅`
b) `-4 < x < -15/4`
`=> x /in ∅`
c) `-2 < x < -1`
`=> x \in ∅`
d) `0 < x < 1/2`
`=> x \in ∅`