Помогите решить уравнения!1) sqrt(4-x)+sqrt(5+x)=3
2) sqrt(x^2-3x-10)-sqrt(x^2-3x-18)=2
3) sqrt(8x+4)=x+2
4) sqrt(8x+12)+sqrt(3x+12)+x=4
1) <span>sqrt(4-x)+sqrt(5+x)=3 </span>
<span>sqrt(4-x) = 3 - sqrt(5+x) </span>
<span>4-x = 3^2 - 2*3*(5+x) + 5 +x</span>
<span>4-x = 9 -30 -6x +5 +x</span>
<span>4-x = -5x - 16</span>
<span>-x+5x=-16-4</span>
<span>4x=-20</span>
<span>x=-5</span>
<span>2) долго писать)</span>
<span>3)<span> sqrt(8x+4)=x+2</span></span>
<span><span>8x+4=X^2+4x+4</span></span>
-x^2+8x-4x+4-4=0
-x^2+4x=0
x(-x+4)=0
x=0
X+4=0
X=-4
4) подобное
<span> </span>