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(7/9-1/6)-[(-5/18)-(-5/12)]

Răspuns :

(7/9-1/6)-[(-5/18)-(-5/12)] =
=7/9-1/6+5/18-5/12 =
=(7*4-1*6+5*2-5*3)/36=
=(28-6+10-15)/36=17/36