Odpowiedzi

2010-04-06T18:06:41+02:00
( x - 5 )( x + 2 ) - ( 3 - x )( 2 - x ) = x - 12
x²+2x-5x-10-(6-3x-2x+x²)=x-12
x²+2x-5x-10-6+3x+2x-x²=x-12
2x-16=x-12
x=4