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Rezolvati in multimea numerelor rationale ecuatiile:c)7/4-x/3=9/3

Răspuns :

Dariuca06io

7/4=21/12 |

X/3=4x/12 |=>

9/3=3 |

=> 21/12-4x/12=3

(21-4x)/12=3

21-4x=36

21=36+4x

21-36=4x

-15=4x

X=-15/4

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