hoanghoai5476609
hoanghoai5476609 hoanghoai5476609
  • 23-07-2021
  • Mathematics
contestada

cho x,y thuộc n thoả mãn x hia 3 dư 1,y chia 3 dư 2.hỏi x.y chia 3 có số dư bằng bao nhiêu

Respuesta :

dothiquynhanhk18dpt
dothiquynhanhk18dpt dothiquynhanhk18dpt
  • 23-07-2021

Answer:

2

Step-by-step explanation:

x÷3 dư 1-->x=3a+1

y÷3 dư 2-->y=3b+2

x×y=(3a+1)×(3b+2)

=9ab+6a+3b+2

Mà 9ab, 6a, 3b chia hết cho 3, 2 chia 3 dư 1

==>x×y chia 3 dư 2

Answer Link

Otras preguntas

Which statement best describes a key aspect of mercantilism? (1) removing tariffs to increase free trade between empires (2) acquiring colonies to provide a fav
What is the value of the expression? –83 the three is an exponent
what does army corp mean
which number is its own opposite
what is the value of a cube shaped box with edges 6 cm. in length?
how did scientific advancements affect geographic knowledge
Ten times the sum of half a number and 6 is 8
greatest common factor of 25 and 35
The Milky Way Galaxy has at least two hundred billion stars write half this number of stars in standard form
Newborn human babies with lesser body weight are prone to infections. Heavier babies are difficult to deliver through the narrow pelvic passage of human mothers