bằng nhau

vì aaaa * 9= cccc * 9

Notes: Name of school – Place – The building – The Principal – Teachers – Library, field, etc.

The name of my school is Oxford English School. It is situated in the middle of the town I live in. it is a very large school.

The school building is old but beautiful. There are many classrooms in it. The Principal is a middle-aged European. He is a kind and very efficient man.

The teachers of my school are of many races. Some are Chinese, some are Malay and some are Indian. There are also a few European teachers. They are all very clever and hardworking teachers. All the pupils them very much.

As there are many pupils in my school, the library, the play ground and the hall are all very large. Pupils may be seen learning in the library, playing in the playground or performing gymnass in the hall with great interest.

I am indeed proud of my school.

120

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

\(\frac{a}{4}=\frac{b}{5}=\frac{c}{2}=\frac{a+b}{4+5}=\frac{10}{9}\)

=> a = 10/9 x 4 = 40/9

      b = 10/9 x 5 = 50/9

      c = 10/9 x 2 = 20/9

3x4x5= 60 Bạn nhé

k mình nha !!!!!!!!!!!!!!!!!!!!!!!!!

lộn là 10240000000000

Ta có: \(\frac{a}{4}=\frac{b}{5}=\frac{a+b}{4+5}=\frac{10}{9}\)

\(\Rightarrow\frac{a}{4}=\frac{10}{9}\Rightarrow9a=40\Rightarrow a=\frac{40}{9}\)

\(\Rightarrow\frac{b}{5}=\frac{10}{9}\Rightarrow9b=50\Rightarrow b=\frac{50}{9}\)

\(\Rightarrow\frac{c}{2}=\frac{10}{9}\Rightarrow9c=20\Rightarrow c=\frac{20}{9}\)

Totals cans would I have :

   15*15+14*14+13*13+12*12+11*11+10*10+9*9+8*8+7*7+6*6+5*5+4*4+3*3+2*2+1*1=1240(cans)

Đáp số : 1240 cans

Greatest resultly for mathemas contest Violympic( kết quả đã được kiểm chứng )

R=U/I ➜ R=220/0,35=628,57Ω

A=P*t

P=U*I=220*0,35=77 đổi ra KW=0,077KW

t=5h

A=P*t=0,077*5g*30 ngày*1000 đồng=11550 VND