Question

А) 45*38+45*11 делится на 49; В)14900*17-2586 на 2; Б) 7470-333 на 9; Г)4358*125-350*729 на 10.

Answer 1

А) Да— 45
Б) Да— 125357
В) Да— 793
Г) Да— 519235

Answer 2

To check whether each expression is divisible by the given number, we need to calculate the value of each expression and then check if the result is divisible by the specified divisor. Let's do the calculations:

А) 4538 + 4511 = 1710 + 495 = 2205

Is 2205 divisible by 49? To check divisibility by 49, we need to see if 2205 is divisible by 7 and also by 7 again.

2205 ÷ 7 = 315 315 ÷ 7 = 45

Since the result is an integer (45), the expression is divisible by 49.

Answer: А) 4538+4511 is divisible by 49.

B) 14900*17 - 2586 = 253300 - 2586 = 250714

Is 250714 divisible by 2? Yes, since the number ends in an even digit (4), it is divisible by 2.

Answer: B) 14900*17-2586 is divisible by 2.

C) 7470 - 333 = 7137

Is 7137 divisible by 9? To check divisibility by 9, we need to sum its digits and see if the sum is divisible by 9.

7 + 1 + 3 + 7 = 18

Since 18 is divisible by 9, the entire number is also divisible by 9.

Answer: C) 7470-333 is divisible by 9.

D) 4358125 - 350729 = 544750 - 255150 = 289600

Is 289600 divisible by 10? To check divisibility by 10, we only need to look at the last digit. If it is 0, then the number is divisible by 10.

The last digit of 289600 is 0, so it is divisible by 10.

Answer: D) 4358125-350729 is divisible by 10.

To summarize: A) 4538+4511 is divisible by 49. B) 1490017-2586 is divisible by 2. C) 7470-333 is divisible by 9. D) 4358125-350*729 is divisible by 10.