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desfaceti parantezele si reduceti termenii asemenea:

-21x^2-(-7x^2+2x)-8-(3x^2-2x-5)=


VA ROG AJUTOR URGENT


Răspuns :

=-21+7×^2-2×-8-3×^2+2×+5
=-17×^2-3=
=-×^2=3+17
=-×^2=20/-1
=×^2=-20
=×=20÷2
=×=-10