Răspuns :
Răspuns:
√21•(√28-2√75)+3√21•(2√48-√63) =
= √21•[√28-2√75+3•(2√48-√63)]
= √21•[2√7-10√3+3(8√3-3√7)]
= √21•(2√7-10√3+24√3-9√7)
= √21•(-7√7+14√3)
= √21•(14√3-7√7)
= √21•7(2√3-√7)
= 7√21•(2√3-√7)
EVERGREEN
Răspuns:
√21•(√28-2√75)+3√21•(2√48-√63) =
= √21•[√28-2√75+3•(2√48-√63)]
= √21•[2√7-10√3+3(8√3-3√7)]
= √21•(2√7-10√3+24√3-9√7)
= √21•(-7√7+14√3)
= √21•(14√3-7√7)
= √21•7(2√3-√7)
= 7√21•(2√3-√7)
EVERGREEN