Đáp án:
36 cách
Giải thích các bước giải:
(3,5)=3.5=15, 15:15=1
(1,15)=1.15=15, 15:15=1
(3,10)=3.10=30, 30:15=2
(2,15)=2.15=30, 30:15=2
(5,6)=5.6=30, 30:15=2
(1,30)=1.30=30, 30:15=2
(5,9)=5.9=45, 45:15=3
(1,45)=1.45=45, 45:15=3
(3,15)=3.15=45, 45:15=3
(1,60)=1.60=60, 60:15=4
(2,30)=2.30=60, 60:15=4
(3,20)=3.20=60, 60:15=4
(4,15)=4.15=60, 60:15=4
(5,12)=5.12=60, 60:15=4
(6,10)=6.10=60, 60:15=4
(1,75)=1.75=75, 75:15=5
(3,25)=3.25=75, 75:15=5
(5,15)=5.15=75, 75:15=5
(1,90)=1.90=90, 90:15=6
(2,45)=2.45=90, 90:15=6
(3,30)=3.30=90, 90:15=6
(5,18)=5.18=90, 90:15=6
(6,15)=6.15=90, 90:15=6
(9,10)=9.10=90, 90:15=6
(1,105)=1.105=105, 105:15=7
(3,35)=3.35=105, 105:15=7
(5,21)=5.21=105, 105:15=7
(7,15)=7.15=105, 105:15=7
(1,120)=1.120=120, 120:15=8
(2,60)=2.60=120, 120:15=8
(3,40)=3.40=120, 120:15=8
(4,30)=4.30=120, 120:15=8
(5,24)=5.24=120, 120:15=8
(6,20)=6.20=120, 120:15=8
(8,15)=8.15=120, 120:15=8
(10,12)=10.12=120, 120:15=8
Vậy có 36 cách
