Question

1 вариантт 6) (5x-2y)(x+y)+5x2 7) 3 (x-4)(x+2)+(3x-1)(5-x) 8) 4(m-nf+4m(m-n) 9) (3m-a)(а+3m)-(2a+m)(3а-м) 10) 6×(5x-24) – 4(3-2х)​

Answer 1

Ответ:

6)(5x-2y)(x+y) + 5x^2 = 5x(x+y) - 2y(x+y) + 5x^2 = 5x^2 + 5xy - 2xy - 2y^2 + 5x^2 = 10x^2 + 3xy - 2y^2

7)3(x-4)(x+2) + (3x-1)(5-x)= 3(x^2-2x-4x+8) + (3x-1)(5-x) = 3(x^2-6x+8) + (-3x^2+8x+5x-5) = 3x^2-18x+24-3x^2+13x-5= -5x+19

8)4(m - nf) + 4m(m - n)= 4m - 4nf + 4m^2 - 4mn= 4m^2 - 4mn - 4nf + 4m

9)(3m - a)(a + 3m) - (2a + m)(3a - m)= 9m^2 + 3am - a^2 - 6a^2 + 2am + 3am - m^2= 9m^2 + 6am - 7a^2 - m^2

10)6×(5x-24) – 4(3-2х) = 30x - 144 - 12 + 8x = 30x + 8x - 144 - 12 = 38x - 156