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e)(√6-3√3)^2=(√6)^2-2*√6*3√3+(3√3)^2=6-6√18+27=33-6*3√2=33-18√2
f)(2√32-3√2)^2=4*32-2*2√32*3√2+9*2=128-12√64+18=146-12*8=146-96=50
8
a)(2-3√3)(2-3√3)=(2-3√3)^2=4-2*2*3√3+(3√3)^2=4-12√3+27=31-12√3
b)(7+5√2)(5√2+7)=(5√2+7)^2=(5√2)^2+2*5√2*7+49=50+70√2+49=99+70√2
c)(4√5+√3)(4√5-√3)=16*5-3=80-3=77
d)(√8+2√6)(2√6-√8)=(2√6+√8)(2√6-√8)=4*6-8=24-8=16
musisz nauczyć się wzorów skróconego mnożenia