If B is not divisibly by 24 and B is the greatest 5 - digit number that the sum of all digits is 21 then B = ................
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If B is not divisible by 24 and B is the greatest 5 - digit number that the sum of the sum of all digits is 21 then B = ?
If B is not divisible by 24 and B is the greatest 5 - digit number that the sum of all digits is 21 then B= ?
Nếu B là không chia hết cho 24 và B là số 5 chữ số lớn nhất mà tổng của tất cả các chữ số là 21 thì B = ...........
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If A is divided by 9 then the sum of the quotient and 9 is the greatest 2-digit number. Find the value of A. Answer: A =
Nếu A chia cho 9 thì tổng của giá trị và 9 là số lớn nhất 2 chữ số. Tìm giá trị của A. Trả lời: A =
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Câu 10:
If A is divided by 9 then the sum of the quotient and 9 is the greatest 2-digit number. Find the value of A.
Answer: A =
:
If A is divided by 9 then the sum of the quotient and 9 is the greatest 2-digit number. Find the value of A.
Answer: A =
dich ra tieng viet:
neu a chia het cho 9 thi tong cua thuong do va 9 la so lon nhat co 2 chu so. tim gia tri cua a.
giai:
số lớn nhất có 2 chữ số là 99.
ma tong cua 9 voi mot so la 99 thi thuong la 90.
a la 90*9=810
d/s:810
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Bài này đáp số là 810, mình làm rồi đúng đấy.
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Exer 1: Given two natural numbers whose sum are 78293. The bigger number where 5 is the units digit and 2 is hundred digit. If we clean these digits then we obtain a number which equals the smaller number. Find two natural numbers.
Exer 2: Prove that: If x, y in N and x + 2y divisible by 5 then 3x - 4y divisibles by 5.
Exer 3: Given that 2x + 5y ⋮ 7. Prove that 4x + 3y ⋮ 7.
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Exer 1: Given two natural numbers whose sum are 78293. The bigger number where 5 is the units digit and 2 is hundred digit. If we clean these digits then we obtain a number which equals the smaller number. Find two natural numbers.
Exer 2: Prove that: If x, y \(\in\) N and x + 2y divisible by 5 then 3x - 4y divisibles by 5.
Exer 3: Given that 2x + 5y \(⋮\) 7. Prove that 4x + 3y \(⋮\) 7.
Exer 1:
Solution:
Suppose that, the unknown number is: \(\overline{x215}\) (where x \(\in\) N).
When we clean three digits then the smaller number is \(\overline{x}\).
We have: \(\overline{x215}\) + \(\overline{x}\) = 78293
\(\Rightarrow\) 1000. \(\overline{x}\) + 215 + \(\overline{x}\) = 78293
1001. \(\overline{x}\) = 78078
x = 78
Thus, we found two natural number: 78215 and 78.
Exer 2:
Solution:
We have: x + 2y \(⋮\) 5
\(\Rightarrow\) 2x + 4y \(⋮\) 5
(2x + 4y) + (3x - 4y) = 5x \(⋮\) 5
\(\Rightarrow\) 2x + 4y \(⋮\) 5
Deduce 3x - 4y \(⋮\) 5.
Exer 3:
Solution:
We have: 2x + 5y \(⋮\) 7
4x + 10y \(⋮\) 7
(4x + 10y) - (4x + 3y) = 7y \(⋮\) 7
\(\Rightarrow\) 4x + 10y \(⋮\) 7
Deduce 4x + 3y \(⋮\) 7.
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What is the largest 3-digit number that has all of its digits different and is equal to 37 times the sum of its digit ?
The greatest 2-digit number that product of all its digits is 6 is:?
If A is divided by 9 then the sum of the quotient and 9 is the greatest 2-digit number. Find the value of A.
