Решите неполное квадратное уравнение 2 - го вида (формула 

с=0 

ах²+вх=0 )

а) 4у² = у

б) 6х²= -х

в) 3z-z²=3z²

г) х²+1 = х + 1

д) 2у - у² = 4у - 5у²

е) z = 7z² - 6z

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