how can find lcm of fraction number.

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se chss
se chss 2023-4-17
回答： Aman 2023-6-2
a = 3/10, b = 4/7
how can i find lcm of a and b?
matlab fucntion lcm input must be integer, so i cannot use lcm function.
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-4-17
Hint - There is a method to obtain LCM of fractional numbers. Search on the internet.

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回答（1 个）

Aman
Aman 2023-6-2
Hi there,
Here are the steps to find LCM of fractions a/b and c/d:
  1. Find the LCM of b and d = LCM(b,d)
  2. Multiply the numerator and denominator of both the fractions by LCM(b,d), After this multiplication, denominator of both fractions are same.
  3. Find LCM of the new numerators and the answer is LCM(new numerators)/LCM(b,d).
Here is the MATLAB implementation of the above algorithm:
a = 3/10;
b = 4/7;
[na, da] = rat(a);
[nb, db] = rat(b);
d_lcm = (da * db) / gcd(da, db);
an = na * d_lcm / da;
bn = nb * d_lcm / db;
num_lcm = an*bn / gcd(an,bn);
lcm_result = num_lcm/d_lcm;
Hope this helps!

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