đường hô hấp

đường hô hấp

đường hô hấp

9 nghìn đồng

9 nghìn đồng

Bài 7:

Ta thấy: $\widehat{xOy}+\widehat{yOx'}=\widehat{xOx'}=180^0$

$\widehat{xOy}-\widehat{yOx'}=30^0$

$\Rightarrow \widehat{yOx'}=\frac{180^0-30^0}{2}=75^0$

$\widehat{xOy'}=\widehat{yOx'}=75^0$ (hai góc đối đỉnh)

Bài 8:

$\widehat{AOC}+\widehat{BOD}=140^0$

$\widehat{AOC}=\widehat{BOD}$ (hai góc đối đỉnh)

$\Rightarrow \widehat{AOC}=\widehat{BOD}=\frac{140^0}{2}=70^0$

$\widehat{COB}=180^0-\widehat{AOC}=180^0-70^0=110^0$

$\widehat{DOA}=\widehat{COB}=110^0$ (hai góc đối đỉnh)

2 she had got the price of the contest, she would be happy now

3 I had gone to the concert last night ,I would be tired

4 John had finished all his homework, he could see a movie now

5 we had listened to my mother, we wouldn't be in trouble right now

Ex5

1 you arrive at the offcie earlier than I do, please turn on the air-conditioner

2 Were it not snowy, the children would go to school

3 he not died so young, he would be a famous musician

4 Were I you, I would take care of my car

5 not very bad-tempered, his wife would give him soon are marrage

6 Had she not got married at such an early age, he would be at university

Bạn ơi, bạn chụp hình lại đi bạn

các bn ơi...!!

à mình nhầm!!! đó là sách lớp 6 nha mn. ko phải lớp 5 đâu ạ. mong mn giúp !!! 

mn ai biết thì giúp với ạ

1: A=-1/2*xy^3*4x^2y^2=-2x^3y^5

Bậc là 8

Phần biến là x^3;y^5

Hệ số là -2

2:

a: P(x)=3x+4x^4-2x^3+4x^2-x^4-6

=3x^4-2x^3+4x^2+3x-6

Q(x)=2x^4+4x^2-2x^3+x^4+3

=3x^4-2x^3+4x^2+3

b: A(x)=P(x)-Q(x)

=3x^4-2x^3+4x^2+3x-6-3x^4+2x^3-4x^2-3

=3x-9

A(x)=0

=>3x-9=0

=>x=3