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TT
1
2 tháng 6 2021
\(A=\left(\frac{x}{x+2}+\frac{x^3}{\left(x+2\right)\left(x^2-2x+4\right)}.\frac{x^2-2x+4}{4-x^2}\right):\frac{4}{x+2}\)
\(A=\left(\frac{x}{x+2}+\frac{x^3}{x+2\left(4-x^2\right)}\right):\frac{4}{x+2}\)
\(A=\left(\frac{4x-x^3+x^3}{x+2\left(4-x\right)}\right):\frac{4}{x+2}\)
\(A=\frac{4x}{x+2\left(4-x\right)}.\frac{x+2}{4}\)
\(A=\frac{x}{4-x}\)
\(b,\frac{x}{4-x}>0\)
xét 2 trường hợp x>0 đồng thời 4-x>0 (điều kiện x\(\ne\)4) và x<0 ,4-x<0
\(TH1:0< x< \text{4}\)
\(TH2:\)ko có giá trị x
\(c,Ax=\frac{x}{4-x}x\)=\(\frac{x^2}{4-x}\)
\(\frac{x^2-16+16}{4-x}\)
\(\frac{\left(x-4\right)\left(x+4\right)+16}{4-x}\)
\(-\left(x+4\right)+\frac{16}{4-x}\)
để AX nguyên thì \(16⋮4-x\)
lập bảng ra tìm đc x = 0,2,-4,-12,5,6,8,12,20
NT
1
7 tháng 10 2021
a: Xét (O) có
CM là tiếp tuyến có M là tiếp điểm
CN là tiếp tuyến có N là tiếp điểm
Do đó: CM=CN
hay C nằm trên đường trung trực của MN(1)
Ta có: OM=ON
nên O nằm trên đường trung trực của MN(2)
Từ (1) và (2) suy ra OC là đường trung trực của MN
21 tháng 7 2021
1. I was given a notebook as a reward by my teacher.
2. Grapes are picked and then turned into wine.
3. I wasn't allowed to stay up late by my father.
4. Pencils aren't used in your Maths exam.
5. I was allowed to go picnic with my friends by my parents yesterday.
6. I wasn't told about his story.
7. This cake is made by me.
8. When I was a child, my leg was bitten by a dog.
9. Many social skills are needed when you enter the workplace.
KY
21 tháng 7 2021
1, I was given a notebook by my teacher as a reward
or A notebook was given to me by my teacher as a reward
2, Grapes are picked and wine is turned into
3, I am not allowed to stay up late by my father
4, pencils are not used in your maths
5, i was not allowed to go picnic with my friends by my parents yesterday
6, i was not told about his story
7, this cake was made by me
8, When I was a kid, my leg was bitten by a dog
9, many social kills are needed when the workplace is entered
A
0
NP
0
1 too
2 either
3 either
4 too
5 too
có not thì dùng either, không not thì too