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-12x-[4y²-7] + 5x =-12x-4y²+7+5x
Podstawiam liczby za x i y: x=-2
y=1/4
-12*(-2)-4*(1/4)²+7+5*(-2)=24-4*1/16+7-10=24-1/4-3=21-1/4=20 3/4
Pozdrawiam Kasia ;)
=24-(4*0,0625-7)-10=
=24-(0,25-7)-10=
=24+6,75-10=
=20,75
-12x- [4y²-7] +5x=
-12x (-2)-[4*(1/4)² -7] + 5*(-2)=
24-4*1/16 +7-10=
21-4/16=
336/16-4/16= 20,75