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b) (3 + 2b ) (1 - b + 5c)= 3-3b+15c+2b-2b²+bc=-2b²+bc-b²+15c+3
c) (a - √2 ) ( b + √3) =ab+ a√3- b√2 - √6
e) 5 - (2√2x + √2 + √8) ( x - √8) = 5 - x²2√2 +x√2+x√8- 8+4-8=1- x²2√2 +x√2+x√8
f) (- 2xy)² - ( 1 - x² ) ( y² - 1 ) + 2xy=
4x²y² - (y²-x²y²-1+x²) + 2xy=
4x²y² - y²+x²y²+1-x² + 2xy=
5x²y² - y²+1-x² + 2xy
chyba tak ;]