Explicación paso a paso:
x+y=80 (+)
x-y=30
-------------
=2x+y-y=80+30
=2x=110
=x=55
x+y=80 55+y=80 y=25
mcm(55;25):
55-25|5
11- 5 |5
11- 1 |11
1-1
mcm(55;25)=5²*11=25*11=275
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Explicación paso a paso:
x+y=80 (+)
x-y=30
-------------
=2x+y-y=80+30
=2x=110
=x=55
x+y=80 55+y=80 y=25
mcm(55;25):
55-25|5
11- 5 |5
11- 1 |11
1-1
mcm(55;25)=5²*11=25*11=275