1)
2x - 3 (4 - x) = 5 - (x - 1)
2x - 12 + 3x = 5 - x + 1
6x = 18
x = 3
2)
5x - 6 (2x + 7) = 13 - (x + 1)
5x - 12x - 42 = 13 - x - 1
-6x = 54
x = -9
X(x+6)<18
1/27(x+3)^2<1
3(-1-3^1/2)<x<3((3^1/2)-1)
(3(-1-3^1/2), 3((3^1/2)-1))
Ответ:
Объяснение:
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9a^2-(a+2b)^2=(3a-a-2b)(3a+a+2b)=(2a-2b)(4a+2b)=4(a-b)(2a+b).
(m+n)^2-p^2=(m+n+p)(m+n-p)
2 целых 1/4:0.5-1 целая 1/3 * 2.25-4.5=4.5-1.5-4.5=-1.5