Question

Помагите контрольна робота

Answer 1

8) $-3z*(\frac{1}{3} z-y)+6x*(\frac{1}{6} z-\frac{1}{3} y)=-z^2+3yz+z^2-2yz=yz$

10) $(3-x)*(2+x)-(4-x)*(3+x)=5-x$

$6+3x-2x-x^2-(12+4x-3x-x^2)=5-x$

$6+3x-2x-x^2-(12+x-x^2)=5-x$

$6+3x-2x-x^2-12-x+x^2=5-x$

$6+3x-2x-12-x=5-x$

$6+3x-2x-12=5$

$-6+x=5$

$x=5+6$

x = 11

11) $5x*(4-x)-x*(2-5x)=2(5x-8)$

$20x-5x^2-2x+5x^2=10x-16$

$18x=10x-16$

$18-10x=-16$

$8x=-16$

x = -2

12) $3x*(1-2x)*(|x|-8)=0$

$x*(1-2x)*(|x|-8)=0$

$x=0$

$1-2x=0$

$|x|-8=0$

x₁ = -8, x₂ = 0, x₃ = $\frac{1}{2}$, x₄ = 8