Alan is a lorry -driver. He's 25 years ....old..... He works five days .....a.... week. Every morning he gets up at 6 o'clock. He eats ....an..... enormous breakfast at 6.30. He ...drinks... two cups of tea. Then he kisses ..his... wife. He leaves for work at 7.30. He ..has... lunch in a transport cafe. He ..comes.... home at 5 o'clock. In the evening he goes to the pub. He goes to ...bed..... at 10.30.

1.What does he do ?

2.How many days a week does he work ?

3.What time does  he get up ?

4.Does he drink coffee in the morning ?

5.What time does he leave work ?

6.Where does he have lunch ?

7.Does he go to the cinema in the evening ?

Tiền vốn để mua hàng là:

  800000x(100%-25%) = 600000 (đồng)

a)\(n_{CuSO_4}=0,4.0,5=0,2\left(mol\right)\)

\(PTHH:CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

Mol:               0,2                0,4                   0,2

⇒ \(m_{Cu\left(OH\right)_2}=0,2.98=19,6\left(g\right)\)

b)\(C_{M\left(ddNaOH\right)}=\dfrac{0,4}{0,3}=1,3\left(M\right)\)

c)\(PTHH:Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)

Mol:                 0,2                   0,2

=> m_CuO = 0,2.80 = 16 (g)

chữ hơi xấu nhưng vẫn còn đọc đc

C

C

a,x³-27+3x(x-3)

=(x-3)(x²+3x+9)+3x(x-3)

=(x-3)(x²+6x+9)

=(x-3)(x+3)²

b,5x³-7x²+10x-14

= x²(5x-7)+2(5x-7)

= (5x-7)(x²+2)

D

B