481abc : abc = 1481

481 . 1000 + abc = 1481abc

481000 = 1481abc - abc

481000 = 1480abc

abc = 481000 : 1480

abc = 325

Vậy số abc là: 325

Ta có:

481abc : abc = 1481  

=> 481.1000 + abc = 1481abc 

=> 481000 = 1480abc 

=> abc =481000/1480 = 325 

Vậy abc = 325

481xabc:abc=481xabcx1/abc=481x1=481

481abc : abc = 1481
=> 481.1000 + abc = 1481abc
=> 481000 = 1480abc
=> abc =481000/1480 = 325
* thử lại: 481325/325=1481

481abc:abc=1481

\(\Rightarrow\) (481000+abc)\(⋮\) abc=1481

\(\Rightarrow\) 481000:abc+1=1481\(\Rightarrow\) 481000\(⋮\) abc = 1480

Vậy abc =481000:abc=325 , do đó a=3, b=2,c=5 

mik ko chắc chắn đâu

\(\overline{481abc}\div\overline{abc}=1481\)

\(\left(481000+\overline{abc}\right)\div\overline{abc}=1481\)

\(481000\div\overline{abc}+\overline{abc}\div\overline{abc}=1481\)

\(481000\div\overline{abc}+1=1481\)

\(481000\div\overline{abc}=1481-1\)

\(481000\div\overline{abc}=1480\)

\(\Rightarrow\overline{abc}=481000\div1480\)

\(\Rightarrow\overline{abc}=325\)

Vậy số cần tìm là 325 

(481000 + abc) : abc = 1481 
481000:abc + 1 = 1481 
abc = 481000: 1480 = 325

481abc : abc = 1481

(481000 + abc ) : abc = 1481

481000 : abc + 1 = 1481

abc = 481000 : 1480 = 325

481abc : abc = 1481

(481000 + abc) : abc = 1481

481000 : abc +1 = 1481

481000 : abc = 1480

abc = 481000 : 1480 = 325

các ban giai giup ........ hi ...hi

3bfja BWJBVNJVBSJNvbjbkfjgwegbwjbfejgb4

kfwgwbljbg,wbgjsbwgjr

mfkwsghgiwhrg

kgwkrgjrwhgwhrgjwbjgbwjgbwe

w3jtsgbgejdbjwbgkqfb2l4kbgwu

ldm

fcregffjhhkjhgfyheruhyjkhgjdtjhygf

A=(a+b)(b+c)(c+a)+abcA=(a+b)(b+c)(c+a)+abc

=a2b+ab2+a2c+ac2+b2c+bc2+2abc+abc=a2b+ab2+a2c+ac2+b2c+bc2+2abc+abc

=ab(a+b+c)+bc(a+b+c)+ca(a+b+c)=ab(a+b+c)+bc(a+b+c)+ca(a+b+c)

=(a+b+c)(ab+bc+ca)=(a+b+c)(ab+bc+ca)

Vậy....

\((a+b)(b+c)(c-a)+(b+c)(c+a)(a-b)+(c+a)(a+b)(b-c)\)

\(=(b+c)(ac-a^2+bc-ab)+(b+c)(ac-bc+a^2-ab)+(c+a)(a+b)(b-c)\)

\(=(b+c)(ac-a^2+bc-ab+ac-bc+a^2-ab)+(c+a)(a+b)(b-c)\)

\(=(b+c)(2ac-2ab)+(c+a)(a+b)(b-c)\)

\(=(2ab+2ac)(c-b)-(c+a)(a+b)(c-b)\)

\(=(c-b)(2ab+2ac-a^2-ab-ac-bc)\)

\(=(c-b)(b-a)(a-c)\)

giúp mình làm  bài này đi rrooiif mình giúp cho

cho tam giac abc . co canh bc=12cm, duong cao ah=8cm

a> tinh s tam giac abc

b> tren canh bc lay diem e sao cho be=3/4bc. tinh s tam giac abe va s tam giac ace ( bằng nhiều cách

c> lay diem chinh giua cua canh ac va m . tinh s tam giac ame

a) a(b-c)+c(a-b)=ab-ac+ca-cb=ab-cb=b(a-c)

b) a(b-c)-b(a+c)=ab-ac-ab-bc=-ac-bc=-c(a+b)

c) a(b+c)-b(a-c)=ab+ac-ab+bc=ac+bc=c(a+b)

d) a(b-c)-a(b+d)=ab-ac-ab-ad=-ac-ad=-a(a+d)

a) a(b - c) + c(a - b) = ab - ac + ac - bc = ab - bc = b(a - c)

b) a(b - c) - b(a + c) = ab - ac - ab - bc = -ac - bc = (a + b). (-c)

c) a(b + c) - b(a - c) = ab + ac - ab + bc = ac + bc = (a + b)c

d) a(b - c) - a(b + d) = ab - ac - ab - ad = -ac - ad = -a(c + d)

a) a(b-c)+c (a-b)=ab-ac+ca-cb=cb=b(a-c)

b) a(b-c)-b(a+c)=ab-ac-ab-bc=ac-bc=-c(a+b)

c) a(b+c)-a(b(a-c)=ab+ac-ab+bc=ac+bc=c(a+b)

d) a(b-c)-a(b+d)=ab-ac-ab-ad=ac-ab-ad=ac-ad=a(a+d)

a)-b+c

d)-2a-2c

e)2b-2c

b)-2a+b

c)-a+c

f)a

-a-b+a+c=-b+c

-a+b-c-a-b-c=-2a-2c

a+b-a-b+a-c-a-c=-2c

-a-c+a-b-c=-2c+b

b-b-a+c=-a+c

a+b-c+a-b+c-b+c-a-a+b+c=2c