(3b+5)/(b+7)+3=(3b+5+3(b+7))/(b+7)=(3b+5+3b+21)/(b+7)=(6b+26)/(b+7)
A) 3X∧2-5x-2=0
D=49
x1=2
x2=-1/3
3x∧2-5x-2=3(x-2)(x+1/3)
разложение на множители
a) = (2x - 1 + 3)(2x-1-3) = (2x+2)(2x-4)= 2(x+1)2(x-2)= 4(x+1)(x-2)
b) = (2a+(4a+3))(2a-(4a+3)) = (2a+4a+3)(2a-4a-3)= (6a+3)(-2a-3)= - 3(2a+1)(2a+3)
c) = ((4x-y) + (5x-2y))((4x-y) - (5x-2y)) = (4x-y + 5x-2y)(4x-y - 5x+2y) = (9x-3y)(-x+y) = 3(3x-y)(y-x)
2х²-7х=0
х(2х-7)=0
х=0; 2х-7=0
2х=7
х=3,5
Ответ: 0; 3.5
16+8k+k² =(4+k)²
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