1) 6m-3(2m-5n)=?
2) [tex] 4a^{2}-(b-2a)^{2} [/tex]=?
3) [tex] -4(3a)^{2} + (6a-5c)(6a+5c)[/tex]
4) ab-cd=?
5) [tex]4a^{2}b-6ab^{2} =?[/tex]
6) [tex]25x^{2}-16y^{2} [/tex]=?
7) [tex] 9m^{2}-12mn+4n^{2} =?[/tex]
8) 8x+6y=?
9) [tex] -15x^{3} y^{2} +18xy^{4} =?[/tex]
10)[tex] 64m^{2} -49n^{2} =?[/tex]
11)[tex]25a^{2} +40ab+16b^{2} =?[/tex]

хммм, возможно, я ваще не шарю

5625 - 0,5476 = 5624, 4524 -5*8+1000 = -40+1000=960 4a^2-(b-2a)^2 = 4a^2 - (b^2-4ab+4a^2) = 4a^2 - b^2+4ab-4a^2 = -b^2+4ab = -b (b-4a) -4(3a)^2+(6a-5c)(6a+5c) = -4*9a^2 +36a^2 -25c^2= - 25c^2 может так?