a) 8b²+5bc-23bc-15c²=8b²-15c²-18bc
b)15b²-10bc-12bc+8c²=15b²+8c²-22bc
c)3x²+3xy-2xy-2y²=3x²-2y²+xy
d) 10a-5b-8ab+4b²
e)42+6b+21b+3b²=3b²+27b+42
f) 5m+3m²-12m-20=3m²-7m-20
g)-16xy-24x²-8y²-12xy=-28xy-8y²-24x²
h)2zy-3y²-8z²+12zy=14zy-3y²-8z²
i)2a²-5a+6a-15=2a²+a-15
k)-12ab+8a²-3b²+2ab=8a²-10ab-3b²
Proszę o naj ;)
Odpowiedź:
1. (b - 3c)(8b + 5c) = 8b^2 + 5bc - 24bc - 15c^2 = 8b^2 - 15c^2 - 19bc
2. (5b - 4c)(3b - 2c) = 15b^2 - 10bc - 12bc + 8c^2 = 15b^2 + 8c^2 - 22bc
3. (3x - 2y)( x + y) = 3x^2 + 3xy - 2xy - 2y^2 = 3x^2 - 2y^2 + xy
4. (5 - 4b)(2a - b) = 10a - 5b - 8ab + 4b^2
5. (6 + 3b)(7 + b) = 42 + 6b + 21b + 3b^2 = 3b^2 + 27b + 42
6. (m - 4)(5 + 3m) = 5m + 3m^2 - 20 - 12m = 3m^2 - 7m - 20
7. (-4x - 2y)(4y + 6x) = -16xy + 24x^2 - 8y^2 - 12xy = 24x^2 - 8y^2 - 28xy
8. (y - 4z)(2z - 3y) = 2yz - 3y^2 - 8z^2 + 12yz = -3y^2 - 8z^2 + 14yz
9. (a + 3)(2a - 5) = 2a^2 - 5a + 6a - 15 = 2a^2 + a - 15
10. (-4a - b)(3b - 2a) = -12ab - 8a^2 - 3b^2 + 2ab = 8a^2 - 3b^2 - 10ab
Liczę na naj ^^