ПОМОГИТЕ РЕШИТЬ)ЗАРАНЕЕ СПАСИБО
4с(с-2)-(с-4)^2
4ab+2(a-b)^2
3a(a-2)-(a-3)^2
(x-y)^2-x(x-2y)
(a-3)(a-7)-2a(3a-5)
2c(3c+4)-3c(2c+1)
(b+c)(b-c)-b(b-2c)
a(a+5b)-(a+b)(a-b)
(y+10)(y-2)-4y(2-3y)
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ПОМОГИТЕ РЕШИТЬ)ЗАРАНЕЕ СПАСИБО
4с(с-2)-(с-4)^2
4ab+2(a-b)^2
3a(a-2)-(a-3)^2
(x-y)^2-x(x-2y)
(a-3)(a-7)-2a(3a-5)
2c(3c+4)-3c(2c+1)
(b+c)(b-c)-b(b-2c)
a(a+5b)-(a+b)(a-b)
(y+10)(y-2)-4y(2-3y)
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Answers & Comments
1. 4c^2 - 8c - (c^2 -8c+16) = 4c^2 - 8c - c^2 + 8c -16 = 3c^2-16
2. 4ab + 2 ( a^2 - 2ab + b^2) = 4ab + 2a^2 - 4ab + 2b^2 = 2a^2 + 2b^2 = 2(a^2 + b ^2)
3. 3a^2 - 6a -( a^2 - 6a + 9) = 3a^2 - 6a -a^2 + 6a - 9 = 2a^2 - 9
4. x^2 - 2xy + y^2 - x^2 + 2xy = y^2
5. a^2 - 7a - 3a + 21 - 6a^2 + 10a = - 5a^2 + 21
6. 6c^2 + 8c - 6c^2 - 3c = 5c
7. b^2 - c^2 - b^2 + 2cb = 2cb-2c^2
8. a^2- 5ba - a^2 + b^2 = b^2 - 5ba
9. y^2 - 2y + 10y - 20 - 8y + 12y^2 = 13y^2 - 20