GWD 0-36 幫我解一下國小數學

[hoojjj]

請問要如何求解
Q36:
If M is the least common multiple of 90, 196, and 300, which of the following is NOT a
factor of M?
A. 600
B. 700
C. 900
D. 2,100
E. 4,900
Answer:A

[魚]

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[hoojjj]

那M是如何算出來的????
90=2*3*3*5
196=2*2*7*7
300=2*2*5*5*3

[魚]

那M是如何算出來的????
90=2*3*3*5
196=2*2*7*7300=2*2*5*5*3

the least common multiple !!