Question

Упростите выражение: 1. (2а+с)(а-2с)+а(2с-а)=2. (2x+y)(x+y)-6y(x-y)=3. (5x-b)(3x+b)+(3x-b)(b+x)=4. (+3)(c-2)-(c+1)(c-2)=5. (y-4)(y-3)+(y+8)(y-1)=6. (a-6)(a+4)-(a-8)(a-3)=7. 5b(b+8)+(b-7)(b-8)=8. 5b(p-7)-(p-6)(p+5)=

Answer 1

↑ну вот↑ ............

Answer 2

1. (2a+с)(а-2с)+а(2с-а) = 2a^2 - 4ac + ac - 2c^2 + 2ac - a^2 = a^2 - 2ac - 2c^2.

2. (2x+y)(x+y)-6y(x-y) = 2x^2 + 2xy + y^2 - 6xy + 6y^2 = 2x^2 - 4xy + 7y^2.

3. (5x-b)(3x+b)+(3x-b)(b+x) = 15x^2 + 5bx - 3bx - b^2 + 3bx - b^2 + bx + x^2 = 16x^2 - b^2 + 2bx.

4. (+3)(c-2)-(c+1)(c-2) = 3c - 6 - c^2 - c + 2 = -c^2 + 2c - 4.

5. (y-4)(y-3)+(y+8)(y-1) = y^2 - 7y + 12 + y^2 + 7y - 8 = 2y^2 + 4.

6. (a-6)(a+4)-(a-8)(a-3) = a^2 - 2a - 24 - (a^2 - 5a + 24) = -7a - 48.

7. 5b(b+8)+(b-7)(b-8) = 5b^2 + 40b + b^2 - b - 56 = 6b^2 + 39b - 56.

8. 5b(p-7)-(p-6)(p+5) = 5bp - 35b - p^2 - 5p + 30 = -p^2 + 5bp - 5p - 35b + 30.