1) x/3 - x/10 = 10x/30 - 3x/30 = 7x/30 = 7
x/30 = 1
x = 30
2) 2x/9 + 5x/12 = 8x/36 + 15x/36 = 23x/36 = 23
x/36 = 1
x = 36
3) 4x + 5 = (11x - 5)/2
8x + 10 = 11x - 5
15 = 3x
x = 5
1
3a²-1/4*ax-4a+5a³x
2
-6a^4b²+8a³b^5
3
5a²b³(3b^4-4a)
4
(x-y)(6ab^5+15a³b²)=3ab²(x-y)(2b³+5a²)
5
27x³y³-9x^4y-3xy³+9x5+9x^4y=27x³y³-3xy³+9x^5
<span>1) 12b² - 12c² = 12 (b^2 - c^2)
2) 2a²c - 2b²c = 2c (a^2 - b^2)
3) 5a² - 20 = 5 (a^2 - 4)
4) 3mn² - 48m = 3m (n^2 - 16)
5) 7y³ - 7y = 7y (y^2 - 1)
6) a³ - a⁵ = a^3 ( 1 - a^2)
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(a^4+2a^3)+(8a+16)=0; a^3*(a+2)+8*(a+2)=0; (a+2)*(a^3+8)=0; a+2=0 или a^3+8=0. a= -2. Ответ: a= -2. я так думаю.