Oblicz:
a) √2*2√2=
b) (√3+2√2)*(3√2-4√3)=
c) (√7-5√3)*(2√7+√3)=
a)√2·2√2=2√4=2·2=4
b)(√3+2√2)·(3√2-4√3)=3√6+12-12-8√6= -5√6
c)(√7-5√3)(2√7+√3)=2√49 -10√21+√21-5√9=14-9√21-15= -9√21-1
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a)√2·2√2=2√4=2·2=4
b)(√3+2√2)·(3√2-4√3)=3√6+12-12-8√6= -5√6
c)(√7-5√3)(2√7+√3)=2√49 -10√21+√21-5√9=14-9√21-15= -9√21-1