giups mình bài này vs các bạn ơi .. :v
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a: ĐKXĐ: \(x\notin\left\{2;-2;0\right\}\)
b: \(P=\left(\dfrac{-\left(x+2\right)}{x-2}+\dfrac{4x^2}{\left(x-2\right)\left(x+2\right)}+\dfrac{x-2}{x+2}\right)\cdot\dfrac{-x^2\left(x-2\right)}{x\left(x-3\right)}\)
\(=\dfrac{-x^2-4x-4+4x^2+x^2-4x+4}{\left(x-2\right)\left(x+2\right)}\cdot\dfrac{-x\left(x-2\right)}{x-3}\)
\(=\dfrac{4x^2-8x}{x+2}\cdot\dfrac{-x}{x-3}=\dfrac{-4x^2\left(x-2\right)}{\left(x+2\right)\left(x-3\right)}\)
vì 75 chia cho x dư 3 => 72 chia hết cho x
Tương tự : 102 và 120 cũng chia hết cho x
=> x thuộc ước chung của 72 ,102, 120
=> x = { 6; 3; 2;1}
<Bạn tự tóm tắt nha>
MCD RntRntR
Số chỉ vôn kế ở 2 đầu đèn 1 và đèn 2
\(U_{12}=U_1+U_2\)
Số chỉ vôn kế của 2 đầu đèn 2 và đèn 3
\(U_{23}=U_3+U_2\)
Vì đây là mạch nối tiếp nên I=I1=I2=I3
mà các đèn giống nhau nên
\(U_1=U_2=U_3=a\)
Lập tỉ lệ ta dc:\(\dfrac{U_{12}}{U_{23}}=\dfrac{U_2+U_1}{U_2+U_3}=\dfrac{a+a}{a+a}=1\Rightarrow U_{12}=U_{23}\)
Vậy số chỉ của 2 vôn kế là bằng nhau
10. I wasn't able to accept his invitation.
11. I have never read a more interesting novel than this one. / I have never read such an interesting novel.
12. My mother can cook better than I can.
13. I was made to do it by my parents.
10. I wasn't able to accept his invitation.
11. I have never read a more interesting novel than this one / I have never read such an interesting novel.
12. My mother can cook better than I can.
13. I was made to do it by my parents.
/^/ : Cup, heart, cult, dust, uneaty, aunt, unable, umbrella, blood, young.
/a:/ : còn lại.
1.We were very tired that we went to bed early.
2.It is such a difficult lesson that we can't understand it.
3.It is such a old car that he doesn't want to drive it.
4.The weather was too cold for us to go out.
5.It was such a interesting film that we couldn't miss it.
6.David has so many girlfriends that he can't remember all of their names.
7.Tom drives so fast that he often causes accidents.
8.This is such a good tea that I think I'll have another cup.
9.John was too angry to say anything.