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0
2023-04-02 11:48:58
khi tuổi ông thêm 1 tuổi thì tuổi cháu thêm 1 tuổi
Suy ra : hiệu số tuổi của ông và cháu không thay đổi,vẫn là :50 tuổi
hiện nay, cháu có số tuổi là:
(70-50):2=10(tuổi)
Đ/s: 10 tuổi