a, Gọi chiều rộng ban đầu là x(m) x>0

Chiều dài ban đầu : x+10(m)

Chiều rộng sau khi được tăng: x+5(m)

Chiều dài sau khi giảm: x+10-2=x+8(m)

Theo bài ra ta có pt

(x+8)(x+5)-x(x+10)=100

Giải ra được x=20(m)

Chiều dài : 20=10=30(m)

Diện tích mảnh vườn:20.30=600(m\(^2\))

b, Gọi vận tốc trung bình của xe mày là x(km/h) x>0

Vận tốc tb của ô tô là : x+6(km/h)

Theo bài ra ta có pt 

2x+2(x+6)=140

Giải ra được x=32(km/h)

Vtb của ô tô là 32+6=38(km/h)

5 visitors

22 picnicking

23 hungry

24 villagers

31 terribly

32 enjoyable

late next friday so she can't go the the party

is too expensive so I can't buy it
it was hot, I turned on the air conditioner
to the club because of her illness
her exam because she worked hard
on the air conditioner because it was hot
the hard rain, we stay at home
being sick, she couldn't go to shcool yesterday
Nga's tiredness after her trip, she went to bed early
waking up late, Na didn;t have time for breakfast

câu 1:

a)3Fe+2O₂-->Fe₃O₄            HH

b)4P+5O₂-->2P₂O₅        HH

c)2Al+6HCl-->2AlCl₃+3H₂        Thế

d)2K+2H₂O-->2KOH+H₂         Thế

f) Cu+2AgNO₃-->Cu(NO₃)₂ +2Ag            Thế

unpollute

deforestation

environmental

pollution

conservationists

prevention

extremely

environmentalist

protection

seriously

poisonous

1 Will people live

2 Will car look like

3 Will robots replace

4 Will humans live

5 will houses be

6 will computer be taken

7 will fashion be changed

1 . Will people live .

2  . Will car look like .

3 . Will robots replace .

4 . Will humans live .

5 will houses be .

6 . will computer be taken .

7 . will fashion be changed .

47895

=47895

=47895 nha