phanhuytien was wrong

60 + 20 + 80 + 30 + 50 + 10

= (20 + 80) + (30 + 10 + 60) + 50

= 100 + 100 + 50

= 200 + 50

= 250

 Dao Trong Luan was wrong

Multiplies of 3,4,5 => Multiplies of 60 (3.4.5)

So the numbers satisfy is: 60,120,180,240,300,360,420,480.60,120,180,240,300,360,420,480.So there are 8 positive integers satisfy the question

I re to the number of apples:

130-100=30(apples)

   Answer:30 apples

   50+300+50+100

=(50+50)+(300+100)

=100+400

=500

   20+80+40+50+20+60

=(20+80)+(40+60)+(50+20)

=100+100+70

=200+70

=270

8^2 + 5^2 + 15^2

= 64 + 25 + 225

= 64 + ( 25 + 225 )

= 64 + 250

= 314

18.3+25.3+3.7

=18.3+25.3+7.3

=(18+25+7).3

=50.3

=150

Ta has: abcabc = abc000 + abc 

                      = Abc x 1000 + abc 

                      = Abc. (1000 +1)

                      = Abc. 1001

                      = Abc. 7. 11. 13

The abcabc of the abc with 7; 11; 13 => abcabc divide by 7; 11 and 13

1.2.3....100 = 100! = ..........0

Answer:So , the last digit of this product is 0

90+501=591

We have:

10=2.5

20 = 2^2.5

30 = 2.3.5

⇒ G C D ( 10 ; 20 ; 40 ) = 2.5 = 10

We have:SCM

4=2^2

8=2^3

10=2.5

⇒SCM(4;8;10)=2^3.5=8.5=40

We have:

A = 4. 225. 3 = 2700

B = 20. m. 5

But A = B => 20. m. 5 = 2700

=> 100m = 2700

=> M = 27

Answer:M=27

   80+20+40+50+60+20

=(80+20)+(40+60)+(50+20)

=100+100+70

=200+70

=270

I questions for you

The  numbers has  0,2,4,6,8

A=2^2.2^3.2^4.2^5

   =2^(2+3+4+5)

  =2^14

  =16384

A=2^2.2^3.2^4.2^5

  =4.8.16.32

  =16384