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Secondary 1 | Maths
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Date Posted: 3 weeks ago
Views: 159
(a)
15 = 3 × 5
105 = 3 × 5 × 7
525 = 3 × 5 × 5 × 7
LCM(15 , x , 105)=525
x=3 × 5 × 5 = 75
OR
x=5 × 5 = 25
(b)
HCF(A,B)
= 60 = 2² × 3 × 5
A+B
= 480 = 2³× 2² × 3 × 5
= 2² × 3 × 5 × (1+7)
= 2² × 3 × 5 × (3+5)
Ans :
( 60 , 420)
(180 , 300)
15 = 3 × 5
105 = 3 × 5 × 7
525 = 3 × 5 × 5 × 7
LCM(15 , x , 105)=525
x=3 × 5 × 5 = 75
OR
x=5 × 5 = 25
(b)
HCF(A,B)
= 60 = 2² × 3 × 5
A+B
= 480 = 2³× 2² × 3 × 5
= 2² × 3 × 5 × (1+7)
= 2² × 3 × 5 × (3+5)
Ans :
( 60 , 420)
(180 , 300)
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