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-7 (3radical 2+radical3)+3 (radical8+radical12=

Răspuns :

-7 (3radical 2+radical3)+3 (radical8+radical12=-21r2 - 7r3+3r8+3r12=
-21r2-7r3+3*2r2+3*2r3 = 
-21r2-7r3+6r2+6r3=
-15r2-r3