Question

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

Answer 1

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?

Answer 2

хммм, возможно, я ваще не шарю