Mọi người giúp em với ạ! Bài toán như sau: Tìm số tự nhiên có 3 chữ số biết rằng khi ta xóa chữ số 3 ở hàng đơn vị thì số đó giảm đi 705 đơn vị? Mọi người ghi rõ cách làm ra giúp em nha! Thanh you!
nếu ghi như vầy thì khó tính lắm sửa lại một xíu đi –  minhtrikhokhao123 27-05-20 03:44 PM
Gọi số cần tìm là \ overline {ab3} \ Rightarrow \ overline {ab3} -705 = \ overline {ab} \ Rightarrow10. \ overline {ab} + 3-705 = \ overline {ab} \ Rightarrow9. \ overline {ab} = 702 \ Rightarrow \ overline {ab} = 78

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