zad1 Zapisz w najprostszej postaci:
Daje naj za wszystko zrobione dobrze błedne odpowieszi bede zglaszane
a)(a+3)(a-1)+(a-7)(a+5)
b)(26-5)(3-2b)-(3b+2)(b-6)
c)-7c-kwadrat(5c-4)+(3c-kwadrat+c)(6-2c)
d)-2x(3x-5y)-(x+2y)(3x-y)
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a) a^2+2a-3 + a^2-2a-35 = 2a^2-38
b) jeżeli jest 26b
78b-52b^2-15+10b - (3b^2-18b+2b-12) = -55b^2+104b-3
jeżeli 5b^2
78-56b-15b+10b^2 - (3b^2-18b+2b-12) = 7b^2-55b+90
c)-35c^3+28c + 18c^2-6c^3+6c-2c^2 = -41c^3+16c^2+34c
d) -6x^2+10xy-(3x^2-xy+6xy-2y^2) = -9x^2+5xy-2y^2
a) (a+3)(a-1)+(a-7)(a+5) = a^2 +3a -a -3 +a^2 +5a -7a -35 = 2a^2 -38
b) (26-5)(3-2b)-(3b+2)(b-6)= 21(3-2b)-3b^2 +18b -2b +12 =63-42b-3b^2 +18b-2b+12=
= 75 - 26b -3b^2
c) -7c^2(5c-4)+(3c^2+c)(6-2c)=-35c^3+28c^2+18c^2-6c^3+6c -2c^2=-41c^3+44c^2+ 6c
d) -2x(3x-5y) - (x+2y)(3x -y) = -6x^2 +10xy -3x^2 +xy -6xy-2y^2 = -9x^2 +5xy -2y^2