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(1)2 × 5=10
(2)2 × 1=2
(3)2 × 7=14
(4)2 × 4=8
(5)2 × 2=4
(6)2 × 6=12
(7)2 × 8=16
(8)2 × 9=18
(9)2 × 3=6
(10)2 × 5=10
(11)2 × 6=12
(12)2 × 8=16
(13)2 × 7=14
(14)2 × 3=6
(15)2 × 1=2
(16)2 × 2=4
(17)2 × 4=8
(18)2 × 9=18
(19)2 × 4=8
(20)2 × 7=14
(21)2 × 9=18
(22)2 × 5=10
(23)2 × 8=16
(24)2 × 3=6
(25)2 × 1=2
(26)2 × 2=4
(27)2 × 6=12
(28)2 × 1=2
(29)2 × 7=14
(30)2 × 6=12
(31)2 × 2=4
(32)2 × 9=18
(33)2 × 4=8
(34)2 × 5=10
(35)2 × 8=16
(36)2 × 3=6
(37)2 × 5=10
(38)2 × 8=16
(39)2 × 9=18
(40)2 × 3=6