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(2x - 5y)² - 3(2x + 5y)² + (9y +2x)(9y - 2x)=
(2*(-0,5) - 5*0.6)² - 3 *(2*(-0,5 ) + 5*0,6)² + (9*0,6 + 2* (-0,5)) *(9*0,6 - 2(-0,5))=
(-1-3)²-3*(-1+3)²+(5,4+(-1))(5,4-(-1 ))= 16 - 3*4 + (4,4*6,4) =
16-12+28,16 = 4 + 28,16 = 32,16
Teraz jest poprawnie znalazłam już znak potęgi :)