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