tổng của 2 chữ số là 5 thì số đầu tiên phải là 5
ta có 5b = 5 + b = 5
b= 5-5=0
vậy số đó là 50
k mình nha
ta co 5b =5+b=5
b=5-5=0
vay so do la 50
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cac ban oi giup to voi ai lam dau tien to tich cho
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