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9 tháng 10 2017

Gọi số cần tìm la x: thuong cua x chia cho 26 la a thi x chia cho 24 duoc thuong la x+2.

Theo bài ra ta có: x:26=a dư 5  \(\Rightarrow\)x= 26a+5     (1)

                             x:24=a+2 du 5   \(\Rightarrow\)x= 24(a+2) + 5

     suy ra: 26a+5 = 24(a+2)+5

               \(\Rightarrow\)26a = 24a + 48

               \(\Rightarrow\)26a - 24a = 48

              \(\Rightarrow\)2a = 48

              \(\Rightarrow\)a = 48 : 24 = 2

  Thay a= 2 vao (1) ta duoc: x= 26*2 +5 = 57

  Vay so can tim la 57

24 tháng 10 2017

48 ở đâu vậy Đường Quỳnh Giang

2 tháng 3 2017

là 299

3 tháng 3 2017

thaks bạn nha !!!!

16 tháng 2 2016

trả lời đầy đủ cả bài giải nhé
 

17 tháng 2 2016

Từ đề bài ta có được các đẳng thức sau

x=24.r1+5

x=26.r2+5

r1-r2=2=>r1=r2+2

thay vào biểu thức đầu ta được

x=24.(r2+2)+5=24r2+48+5=24r2+53

=>2r2-48=0

r2=24

x=24.24+5=581

17 tháng 2 2016

bạn Trần Quang Đài nhớ lại xem mình có làm sai không nhé, nếu đung mình k cho

16 tháng 2 2016

Tui chỉ ấn 629 thui

co le la vay 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26 tháng 10 2016

4 là số dư lớn nhất trong phép chia cho 5

Gọi số cần tìm là a và b = a + 16

b chia hết cho 5 và thương tăng thêm 4

b chia hết cho 9 và thương tăng thêm 2

Lúc này 2 thương hơn kém nhau 26 + 2 = 28

9 x 5 = 45 nên 45 chia cho 9 bằng 5 và 45 chia cho 5 bằng 9

Số b là : 45 x 28 : (9 - 5) = 315

Số cần tìm là : 315 - 16 = 299

14 tháng 1 2017

299 la đúng đó chắc chắn 100% lun

13 tháng 3 2016

Gọi n là thương của phép chia cho 26, ta được:

26 x n + 5 = 24 x (n+2) + 5 = 24 x n + 48 + 5

2 x n = 48

n = 48 : 2 = 24

Số cần tìm là:

26 x 24 + 5 = 629

Đáp số:629

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