[tex]zad.46.\\\\ a)\\\\-(x^2+x^3)+(x^3-3x^2)-2x^2=2x^2\\\\P=2x^2\\\\L=-(x^2+x^3)+(x^3-3x^2)-2x^2=- x^2-x^3 + x^3-3x^2 -2x^2=-6x^2\\\\L\neq P\\\\(opuszczamy\ nawiasy\ i\ redukujemy\ wyrazy\ podobne , \\\\pamietamy, ze\ znak\ minus\ przed\ nawiasem\ zmienia\ znaki\ w\ nawiasie\ na\ przeciwne )\\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]b)\\\\ (-x^2+y^2)+(x^2-y^2) =0\\\\P=0\\\\L=(-x^2+y^2)+(x^2-y^2)= -x^2+y^2 + x^2-y^2 =0\\\\L=P \\\\odp.Dana\ rownosc\ jest\ prawdziwa.[/tex]
[tex]c)\\\\ (x+y)-(x+y)-(x+y) =x-y\\\\P=x-y\\\\L= (x+y)-(x+y)-(x+y)= x+y - x-y - x+-y=-x-y\\\\L\neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]d)\\\\ 6-(2x-(2x+1))=5\\\\P=5\\\\L=6-(2x-(2x+1))= 6-(2x- 2x-1)= 6- 2x+ 2x+1=7\\\\L\neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]e)\\\\-4.5x^2y*(-2xy^2)^2=-9x^3y^2\\\\P=-9x^3y^2\\\\L=-4.5x^2y*(-2xy^2)^2= -4.5x^2y* 4x^2y^4 =-18x^4y^5\\\\L\neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]f)\\\\-(x^2y+2xy-3)-(3yx^2-3yx+4)=-4x^2y+xy-1\\\\P=-4x^2y+xy-1\\\\L= -(x^2y+2xy-3)-(3yx^2-3yx+4)=- x^2y-2xy+3- 3yx^2+3yx-4=\\\\=-4x^2y+xy-1\\\\L=P \\\\odp.Dana\ rownosc\ jest\ prawdziwa.[/tex]
[tex]f)\\\\ -7x^2y^4=-3y* \frac{2}{3}x* \frac{7}{8} y^2*8xy\\\\L=-7x^2y^4\\\\P=-\not{3}^1y* \frac{2}{\not{3}^1}x* \frac{7}{\not{8}^1} y^2*\not{8}^1xy= -14x^2y^4 \\\\L \neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
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[tex]zad.46.\\\\ a)\\\\-(x^2+x^3)+(x^3-3x^2)-2x^2=2x^2\\\\P=2x^2\\\\L=-(x^2+x^3)+(x^3-3x^2)-2x^2=- x^2-x^3 + x^3-3x^2 -2x^2=-6x^2\\\\L\neq P\\\\(opuszczamy\ nawiasy\ i\ redukujemy\ wyrazy\ podobne , \\\\pamietamy, ze\ znak\ minus\ przed\ nawiasem\ zmienia\ znaki\ w\ nawiasie\ na\ przeciwne )\\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]b)\\\\ (-x^2+y^2)+(x^2-y^2) =0\\\\P=0\\\\L=(-x^2+y^2)+(x^2-y^2)= -x^2+y^2 + x^2-y^2 =0\\\\L=P \\\\odp.Dana\ rownosc\ jest\ prawdziwa.[/tex]
[tex]c)\\\\ (x+y)-(x+y)-(x+y) =x-y\\\\P=x-y\\\\L= (x+y)-(x+y)-(x+y)= x+y - x-y - x+-y=-x-y\\\\L\neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]d)\\\\ 6-(2x-(2x+1))=5\\\\P=5\\\\L=6-(2x-(2x+1))= 6-(2x- 2x-1)= 6- 2x+ 2x+1=7\\\\L\neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]e)\\\\-4.5x^2y*(-2xy^2)^2=-9x^3y^2\\\\P=-9x^3y^2\\\\L=-4.5x^2y*(-2xy^2)^2= -4.5x^2y* 4x^2y^4 =-18x^4y^5\\\\L\neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]
[tex]f)\\\\-(x^2y+2xy-3)-(3yx^2-3yx+4)=-4x^2y+xy-1\\\\P=-4x^2y+xy-1\\\\L= -(x^2y+2xy-3)-(3yx^2-3yx+4)=- x^2y-2xy+3- 3yx^2+3yx-4=\\\\=-4x^2y+xy-1\\\\L=P \\\\odp.Dana\ rownosc\ jest\ prawdziwa.[/tex]
[tex]f)\\\\ -7x^2y^4=-3y* \frac{2}{3}x* \frac{7}{8} y^2*8xy\\\\L=-7x^2y^4\\\\P=-\not{3}^1y* \frac{2}{\not{3}^1}x* \frac{7}{\not{8}^1} y^2*\not{8}^1xy= -14x^2y^4 \\\\L \neq P \\\\odp.Dana\ rownosc\ nie\ jest\ prawdziwa.[/tex]