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Mình sao chép rồi đó , số 9 ở chỗ mình vừa đánh dấu
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Bài 1: Mẹ mãi mãi hơn con 32 tuổi .
Tuổi con hiện nay là:
9 - 2 = 7 ( tuổi )
=> Tuổi con cách đây số năm con bằng 1/9 tuổi mẹ là:
32 : ( 9 - 1 ) = 4 ( tuổi )
Vậy trước đây số năm con bằng 1/9 tuổi mẹ là:
7 - 3 = 4 ( năm )
Đ/số: 4 năm
Tích mik mik tích lại cho!!!!
bài 1 : có thể lập được 2 số tự nhiên
bài 2:1 lần bắt tay là có hai người
trong phòng có số người là :
66 : 2 = 33 ( người )
đ/s
Thiếu gì cách hả bn:
vd: 123 + 456 = 579
.....................
Huhu! Mk là póe cận chắc thành loạn thị lun!
Có 1 chữ số 9 trong dãy số đó.