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

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

At midnight the temperature was –3°F. By 5:00 AM the temperature had fallen by 12°F. What was the temperature at 5:00 AM? a. –15°F b. –9°F c. 9°F d. 15°F

Which term includes all the activities required to keep an organism alive

Relationships among people are a. not influenced by people's ideas and attitudes. b. one of two types—social or working. c. something that must be maintained

use mental math to find which has a greater product 5×50or 5×500

2 fractions that are the equivalent to 0.400

On Earth's surface, the weight of an object equals the product of its mass and _____. v, the speed of the object G, the constant of universal gravitation g,

An apple weighs at 1N. the net force on the apple when it is in free fall is? a. 0N b. 0.1N c. 1N d. 10N e. none of the above

Why did its location make Hawaii attractive to Americans?

Which is the best correction of the sentence fragment? Jill wants to get a new dress. Or a skirt. a. Jill wants to get. A skirt or a new dress. b. Jill wants

how many sixth are equivalent to 1/2