Matematyka 1 Nowa era (zakres podstawowy i rozszerzony) zad13/28
a) (3-√7) (2+2√7)=
b) (√3 + 2√2) (4√3 - √2)=
c) (√6 - 2√3) (2√6 + 6√3)=
d) (5√2 - 2√10) (-3√10 - 2√2)=
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a) (3-√7) (2+2√7)=6-2√7+6√7-2·7=4√7+6-14=4√7-8
b) (√3 + 2√2) (4√3 - √2)=12+8√6-√6-4=7√6+8
c) (√6 - 2√3) (2√6 + 6√3)=12-4√18+6√18-36=2√18-24=6√2-24
d) (5√2 - 2√10) (-3√10 - 2√2)=-15√20+60-20+4√20=-11√4·√5+40=-22√5+40