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snicmaker · Gość

a) (x+1)(x-2)+(x+2)(x-1)=
b) (5k+n)(k-2n)-k(4k+n)=
c) (4y+3)(y-2)-2y(4-2y)=
d) -(3c-2)(c-1)-c(c-2)=
e) 2(3a2-1)-(a+2)(a+2)=
f) 5x2(x2+1)-(x2-2)(x2+3)=

trunks

a) [...] = (x^2 - 2x + x - 2) + (x^2 - x + 2x - 2) = x^2 -x -2 +x^2 -x +2x -2 = -2x +2x^2 -4 +2x = 2x^2 -4
b) [...] = (5k^2 - 10kn + kn - 2n^2) - 4k^2 - kn = -9kn + 5k^2 - 2n^2 - 4k^2 - kn = k^2 - 2n^2 - 10kn
c) [...] = (4y^2 - 8y + 3y - 6) - 8y + 4y^2 = 4y^2 - 5y - 6 - 8y + 4y^2 = 8y^2 - 13y - 6
d)[...] = (-3c + 2)(c-1) - c^2 + 2 = -3c^2 + 3c + 2c - 2 +2 = -4c^2 + 5c
e) [...] = (6a + 4 - 2) - (a^2 +4a^2 +4) = 6a + 4 - 2 - a^2 - 4a^2 - 4 = -5a^2 + 6a
f) [...] = 5x(4x +2) - (4x^2 + 6x - 4x - 6) = 20x + 10x - 4x^2 - 6x + 4x +6 = 28x - 4x^2 + 6