Zad. 2 s. 172
a) 3(2x-1) + 4(1-x) = 6x - 3 + 4 - 4x =2x + 1
b) 2(7x +5) - 6(x-2) = 14x + 10 - 6x + 12 = 8x + 22
c) -2x(8-x) - 5(x2 + 3x) = -16x +2x² - 15x = -3x² - 31xd) 5(3-2x) - (4x + 6) * 3 = 15 - 10x - 12x - 18 = -22x - 3
Zad. 3 s. 172
a) ( - 4x + 8):4 = -4x:4 + 8:4 = -x +2
b) 5x +10y = 5x + 10y = x + 2y
5 5 5c) (6p² - 8pr) : (-2) = 6p² : (-2) - 8pr : (-2) =3p² + 4pr
d) 3x -6xy +1 = 3x - 6xy + 1 = -x + 2xy - 1
-3 -3 -3 -3 3
e) (x² + x -1) : ( -1 ) = (x² + x -1) * (-6) = -6x² - 6x +6
6
f) 2,5x2 - 0,5x + 1 = 2,5x2 - 0,5x + 1 = 0,5x2 - 0,1x + 0,2
5 5 5 5
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Zad. 2 s. 172
a) 3(2x-1) + 4(1-x) = 6x - 3 + 4 - 4x =2x + 1
b) 2(7x +5) - 6(x-2) = 14x + 10 - 6x + 12 = 8x + 22
c) -2x(8-x) - 5(x2 + 3x) = -16x +2x² - 15x = -3x² - 31x
d) 5(3-2x) - (4x + 6) * 3 = 15 - 10x - 12x - 18 = -22x - 3
Zad. 3 s. 172
a) ( - 4x + 8):4 = -4x:4 + 8:4 = -x +2
b) 5x +10y = 5x + 10y = x + 2y
5 5 5
c) (6p² - 8pr) : (-2) = 6p² : (-2) - 8pr : (-2) =3p² + 4pr
d) 3x -6xy +1 = 3x - 6xy + 1 = -x + 2xy - 1
-3 -3 -3 -3 3
e) (x² + x -1) : ( -1 ) = (x² + x -1) * (-6) = -6x² - 6x +6
6
f) 2,5x2 - 0,5x + 1 = 2,5x2 - 0,5x + 1 = 0,5x2 - 0,1x + 0,2
5 5 5 5
Pozdrawiam i liczę na naj :)