Ta có P=F

suy ra P=10m=5*10=50(N)

Bài 1 

a vật lí

b hoá học

bài 2

phản ứng hoá học

Ca(OH)2+CO2 =>CaCO3+H2O

Mk chỉ biết cách này thôi tuỳ hơi dài nhưng đáp án đúng nhé

chiều dài 32*30=960cm

chiều rộng 19*30=570cm

8. The teacher said “We can collect old book for the poor students”

The teacher said that we could collect old book for the poor students

9. “If the weather is fine, I will go on a picnic with my friends,” she said.

She said that if the wheather was fine, she would go on a picnic with her friends.

10. “What would you do if you had three days off ?” I asked him.

I asked Jim what he would do if he had had three days off.

11. “ how long have you stayed here, John?” Lisa asked.

Lisa asked John how long he had stayed there.

12. The porter said to me, "I'll wake you up, when the train arrives in Leeds."

The porter said to me she would wake me up, when the train arrives in Leeds.

 13.”I have to go home to make the dinner”, said Mary.

 Mary said that she had to go home to make the dinner..

14. The man said: “Everyone stopped hunting and killing animals.”

The man said that they had stopped hunting and killing animals

15. The boy said to the woman, “I’ve broken the window of your house.”

The boy said to the woman he had broken  the window of her house

16. Nga said to Nam: “ Don’t play too much.” 

Nga asked Nam not to play too much.

17.‘Shut the door but don’t lock it.’

He told me to shut door but not to lock it…

18.‘Lock the door when you go out.’ My mother said to me

My mother told me to lock the door when I went out …

\(1+6x-6x^2-x^3\)

= (1-x^3)+(6x-6x^2)

=(1-x)(1+x+x^2)+6x(1-x)

=(1-x)( 1+ x+ x^2 + 6x)

=(1-x)(1+x^2 +7x)

Đây bạn ơi!

 đây nè bạn
A ) vì đậu Hà Lan là cây lưỡng tính thụ phấn nghiêm ngặt 

F1 có thể coi là cây tự thụ phấn

B) quy ước gen:A thân cao

                          a thân thấp 

kiểu gen :thân cao AA

                Thân thấp aa

Plai: P            AA        *             aa

            ( thân cao)              (  thấp)

       Gp         A                          a

       F1               Aa(100% cây thân cao)

       F1*F1     Aa         *             Aa

                 ( cao)                 ( cao)

        F2         1AA:2Aa:1aa

suy ra KG F2 là AA , Aa,aa

th1   F2*F2     AA          *            Aa

                     ( cao)                  ( cao)

         Gf2       A                         A,a

         F3         1 AA : 1 Aa ( 100% cây thân cao )

Th2 F2*F2       AA       *            aa

                  ( cao)                ( thấp )

          Gf2       A                        a

           F3             Aa( 100% cây thân cao)

Th3    F2*F2      Aa           *          aa

                      ( cao)                   ( thấp)

          Gf2         A,a                       a

           F3              1Aa: 1aa ( tỉ lệ 1 cao: 1 thấp)

Lai