ta thấy 2,4  * 0 < 8 

           2,4 * 1 < 8

           2,4 * 2 < 8

           2,4 * 3 < 8

suy ra : x có thể là : 0 ; 1 ; 2 ; 3

113 hahahaahhhhhhhhhhh đúng 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luôn mink làm rồi

⇒ Những người vô gia cư đã nhập cư bất hợp pháp.

⇒ Tôi đặt lại hàng của mình.

⇒ Tôi đồng ý với ý kiến của anh.

⇒ Quả cầu pha lê đó thật trong suốt.

⇒ Tôi đã xác định được mục tiêu đời mình.

t1 :40  t2;: 48 t3 32

Bài này có 2 cách giải :

Cách 1 :

Tông số tuổi của ông và cháu :

 45 x 2 = 90 ( tuổi )

Tuổi cháu là :

( 90 - 66 ) : 2 = 12

Tuổi ông là :

 12 + 66 = 78 ( tuổi )

Cách 2 :

Tổng số tuổi của 2 ông cháu :

45 x 2 = 90 ( tuổi )

Tổng số tuổi của ông :

( 90 + 66 ) : 2 = 78 ( tuổi )

Tổng số tuổi cháu là :

78 - 66 = 12 ( tuổi )

Đáp số: .....

      Bài giải

Tổng số tuổi của 2 ông cháu là :

45 x 2 = 90 ( tuoi )

Tuổi ông là:

( 90 + 66 ) : 2 = 78 ( tuoi )

Tuổi của cháu là :

78 - 66 = 12 ( tuoi )

      Đáp số : ông 78 tuổi ; cháu 12 tuổi