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

what is the least common multiple of 8 and 12
choose the sentence that is grammatically correct La Vista bicycle let es de la nina
Why does molotov believe a "second front" should be opened in 1942?
Can u help me with a reading question
Which group of molecules have c h and o in the ratio of 1 2 1?
Amongst other entertainments, roman citizens watched ________ in the colosseum.
What is the meaning of the word "detract" as it is used in sentence 8? 1. to join together 2.To pull in the opposite direction 3. To make or do the opposite 4.t
A playwright's use of meter helps the audience by:
Which best describes the difference between a seismograph and seismogram?   A. A seismograph is the written record of earthquake activity, while a seismogram
Is 5 quarts equal, less, or greater than 20 cups?