Tìm 1 số có 5 chữ số đối xứng có dạng abcba sao cho tổng các chữ số của nó bằng bb và c/2<a<c.
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địt lồn mẹ mày bú buồi đầu buồi liếm lông chim
11 tháng 7 2021
gọi số đó là ab
ta có a+b=5=> =5-b
a^2+b^2=13
<=>(5-b)^2+b^2=13
<=>25-10b+b^2+b^2=13
<=>2b^2-10b+12=0
<=>[b=2=>a=3
[b=3=> a=2
vậy số có 2 chữ số cần tìm là 23 hoặc 32
11 tháng 7 2021
Tham khảo:
gọi số đó là ab
ta có a+b=5=> =5-b
a2+b2=13
<=>(5-b)2+b2=13
<=>25-10b+b2+b2=13
<=>2b2-10b+12=0
<=>b=2=>a=3
<=>b=3=>a=2
Vậy số đó là 32 và 23
lấy mấy hình kia ở đâu vậy anh Giang Hoang