Respuesta:
1/21
Explicación paso a paso:
2/3+2/7=2x7+3x2/3x7=20/21
1/1-20/21=1x21-1x20/1x21=1/21
rpta :1/21
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Respuesta:
1/21
Explicación paso a paso:
2/3+2/7=2x7+3x2/3x7=20/21
1/1-20/21=1x21-1x20/1x21=1/21
rpta :1/21