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1, để 2-x chia het cho x+ 1 thi
2-x = 2 - ( x + 1 )
mà x + 1 chia het cho x+ 1
s ra x+ 1 thuộc u của 2
2. My uncle’s address is 123 Hang Bai. (live)
→……My uncle lives at 123 Hang Bai. …………………………
3. Do you live at 23 Tran Hung Dao street? (is)
→……Is 23 Tran Hung Dao street your address? ………………
4. Is her address 36 Xuan Thuy street? (live)
→……Does she live at 36 Xuan Thuy street? ……………………………………….
5. What is your grandmother’s address? (where)
→……Where does your grandmother live? ……………………
refer
1. Where does she live? (what)
→… What is she address?
2. My uncle’s address is 123 Hang Bai. (live)
→……My uncle lives at 123 Hang Bai.
3. Do you live at 23 Tran Hung Dao street? (is)
→……Is 23 Tran Hung Dao street your address?
4. Is her address 36 Xuan Thuy street? (live)
→……Does she live at 36 Xuan Thuy street?
5. What is your grandmother’s address? (where)
→……Where does your grandmother live?
refer
1. Where does she live? (what)
→… What is she address?
2. My uncle’s address is 123 Hang Bai. (live)
→……My uncle lives at 123 Hang Bai.
3. Do you live at 23 Tran Hung Dao street? (is)
→……Is 23 Tran Hung Dao street your address?
4. Is her address 36 Xuan Thuy street? (live)
→……Does she live at 36 Xuan Thuy street?
5. What is your grandmother’s address? (where)
→……Where does your grandmother live?
Thay x= 1 vào f(x), có:
f(x) = 14+2.13-2.12-6.1-5
f(x) = 1 + 2 - 2 - 6 - 5
f(x) = -10
=> x = 1 không phải là nghiệm của f(x)
Thay x = - 1 vào f(x); có:
f(x) = (-1)4+2.(-1)3-2.(-1)2-6.(-1) - 5
f(x) = 1 - 2 - 2 + 6 - 5
f(x) = -2
=> x = -1 không phải là nghiệm của f(x)
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rùi bn lm típ nha! mk chỉ bk cách này thoy!
dù bạn đăng nhầm nhưng mình vẫn trả lời nha !
a) f(x)- g(x)+h(x) = (x3-2x2+3x+1)-(x3+x-1)+(2x2-1)
f(x)- g(x)+h(x) = x3-2x2+3x+1- x3-x+1+2x2-1
f(x)- g(x)+h(x)= (x3-x3) +(2x2-2x2) +(3x-x)+(1+1-1)
f(x)- g(x)+h(x) = 0+0+2x+1
f(x)- g(x)+h(x) = 2x+1
b) Xét f(x)- g(x)+h(x)=0
Suy ra: 2x+1=0
2x= -1
x = - \(\dfrac{1}{2}\)
refer
3. Do you live at 23 Tran Hung Dao street? (is)
→……Is 23 Tran Hung Dao street your address?
4. Is her address 36 Xuan Thuy street? (live)
→……Does she live at 36 Xuan Thuy street?
5. What is your grandmother’s address? (where)
→……Where does your grandmother live?
Tham khảo:
3. Do you live at 23 Tran Hung Dao street? (is)
→……Is 23 Tran Hung Dao street your address?
4. Is her address 36 Xuan Thuy street? (live)
→……Does she live at 36 Xuan Thuy street?
5. What is your grandmother’s address? (where)
→……Where does your grandmother live?
a) \(P\left(x\right)=2+5x^2-3x^3+4x^2-2x-x^3+6x^5\)
\(=6x^5-4x^3+9x^2-2x+2\)
b) \(P\left(1\right)=6\cdot1^5-4\cdot1^3+9\cdot1^2-2\cdot1+2\)
\(=6-4+9-2+2\)
\(=11\)
1. \(f\left(x\right)=x+x^2-6x^3+3x^4+2x^2+6x-2x^4+1\)
\(\Rightarrow f\left(x\right)=7x+3x^2-6x^3+x^4+1\)
Sắp xếp theo lũy thừa giảm dần của biến x:
\(f\left(x\right)=x^4-6x^3+3x^2+7x+1\)
2. Bậc của đa thức: 4
Hệ số tự do: 1
Hệ số cao nhất: 7
3. \(f\left(-1\right)=\left(-1\right)^4-6.\left(-1\right)^3+3.\left(-1\right)^2+7.\left(-1\right)+1=4\)
\(f\left(0\right)=0^4-6.0^3+3.0^2+7.0+1=1\)
\(f\left(1\right)=1^4-6.1^3+3.1^2+7.1+1=6\)
\(f\left(-a\right)=\left(-a\right)^4-6.\left(-a\right)^3+3.\left(-a\right)^2+7.\left(-a\right)+1=3a+1\)
\(\)
(2x – 3)2 = 36
\(\Leftrightarrow4x-6=32 \)
\(\Leftrightarrow 4x=38\)
\(\Rightarrow x=9,5\)