500000g = 500kg

\((a+b)^4=a^4+4a^3b+6a^2b^2+4a^3+b^4\)

\((a-b)^4=a^4-4a^3b+6a^2b^2-4a^3+b^4\)

61 - 3x = 31

3x = 61 - 31

3x = 30

x = 30 : 3

x = 10

Vậy x = 10

là sao mk vẫn ko hiểu ạ

3x - 17 = 28

3x = 28 + 17

3x = 45

x = 45 : 3

x = 15

Vậy x = 15

\((x−2)(x−2)(x−2)\)

\(=(x-2)^3\)

\(=x^3-3x^2\cdot2+3x\cdot2^2-2^3\)

\(=x^3-6x^2+12x-8\)

1. Jane/ play/ tennis at school (no)

- Does Jane play tennis at school?
- No, she doesn't.

2. Your parents/ at home now (yes)

- Are your parents at home now?
- Yes, they are.

3. He/ have/ breakfast at 6 o'clock every day (yes)

- Does he have breakfast at 6 o'clock every day?
- Yes, he does.

1. You/ have/ an art lesson on monday (no)

- Do you have an art lesson on Monday?
- No, I don't.

2. They/ ride/ their bikes to school (yes)

- Do they ride their bikes to school?
- Yes, they do.

a. They listen to English every day

(-): They don't listen to English every day.

(?): Do they listen to English every day?

b. She plays badminton every afternoon

(-): She doesn't play badminton every afternoon.

(?): Does she play badminton every afternoon?

c. We play volleyball every morning

(-): We don't play volleyball every morning.

(?): Do we play volleyball every morning?

d. He does homework every night

(-): He doesn't do homework every night.

(?): Does he do homework every night?