Question

2. Упростите:
a) 18c² - 2(3c - 1)2
б) (2а +3)(a-3) - 2a(4 - ба)
3) (2x + 3)(3-2x) - (2x-5)²-10x

Answer 1

Объяснение:

18c²-2(6c-2)=18c²-12c+4

2a²-6a+3a-9-8a+2a²=-11a-9

6x-4x²+9-6x-(4x²-20x+25)-10x=-4x²+9-4x²+20x-25-10x=-8x²+10x-16

Answer 2

Ответ:

a) 18c^2 - 2(3c-1)2

= 18c^2-12c + 1

18c * c -12c  +1

6c^2 + 1

б)(2a+3)(a-3) - 2a(4-ba)

2a^2 - 3a + 3a - 9 - 8a +2a^2b

2a^2 -9 -8a +2a^2b

4a^2b-8a-9

3)(2x+3)(3-2x)-(2x-5)^2-10x

6x-4x^2+9-6x-(2x-5)^2-10x

6x-4x^2+9-6x-(2x-5)(-2x+5)

-4x^2+9-4x^2+10x+10x-25

-4x^2-4x^2+20x-16

-8x^2+20x-16|*(-1)

8x^2-20x+16

Объяснение: