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b) 0,09 x² - 0,01 y²=( 0,3 x - 0,1 y) ( 0,3 x + 0,1 y)
c) 4/25 y² - 25 / 4 x² = ( 2/5y - 5/2x ) ( 2/5y + 5/2x)
d) 6 b² - 7 a² = ( √6 b + √7 a ) ( √6 b - √ 7 a)