Question

Aflati rezultatul calcului |2√7+5 supra 3√3 -2√3supra4-√7|÷(-1supra3)³

Answer 1

|(2√7+5)/3√3 -2√3/(4-√7)|:(-1/3)³=I-√3/3I :(-1/27)=√3/3×(-27)=-9√3

(2√7+5)/3√3 -2√3/(4-√7)=
=(2√7+5)√3/9 -2√3(4+√7)/(4-√7)(4+√7)=
=(2√21+5√3)/9 -(8√3+2√21)/(16-7)=
=(2√21+5√3)/9 -(8√3+2√21)/9=
=(2√21+5√3 -8√3-2√21)/9=
= -3√3/9=
=-√3/3