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Tìm 2 số khi biết tổng của nó

Chủ nhật - 17/04/2016 22:11
Tìm 2 số có tổng bằng 900, biết rằng nếu lấy số lớn chia cho số bé thì được thương là 3 và dư 4 (Nguyễn Trần Trúc Anh)
Giải:

Gọi:
x là số lớn
y là số bé

Theo đề bài ta có:
x + y = 900
x = 3.y + 4

Thay vào ta được:
3y + y + 4 = 900
4y = 900 - 4
y = 224
x= 3.224 + 4
x = 676

ĐS: Số lớn là: 676; số bé là: 224

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