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x+y =10.......x+y=10(2)..........x+y=20
2
x-y =5........x-y=5(2).............x-y=10
2
hacemos reduccion:
x+y=20
x-y=10
2x=30............x=30/2.............x=15
si x=15
x+y=20
15+y=20
y=20-15
y=5
los numeros son 5 y 15
y como sabemos su mcm es 15
5 15............3 mcm de 5 y 15 es.........3x5=15
5 5............5
1 1