(ab - 5a + 6b -30)^4 (a^2 + 6a +9)^2 ((аb-5a)+(6b-30))^4 (a^2 + 6a +9)^2
------------------------ * ----------------------= ------------------------- * --------------------=
(ab + 6a +3b +18)^4 (10b - b^2 - 25)^2 ((ab+6a)+(3b+18))^4 (10b - b^2 - 25)^2
(a(b-5)+6(b-5))^4 (a+3)^4 (a+6)^4(b-5)^4 (a+3)^4 (a+6)^4
----------------------* ---------- = -------------------*---------- = ----------------
(a(b+6)+3(b+6))^4 (b-5)^4 (a+3)^4(b+6)^4 (b-5)^4 (b+6)^4
<span>a)5х²=25х</span>
<span>5х²-25x=0</span>
5x(x-5)=0
5x=0 или x-5=0
x=0 x=5
<span>б)100х²-16=0</span>
<span>100х²=16</span>
<span>х²=0,16</span>
<span>x=0,4</span>
<span>x=-0,4</span>
<span><span>в)3х²-11х-4=0</span></span>
<span><span>D=121+48=169</span></span>
<span>x1=4</span>
<span>x2=-1/3(дробью)</span>
<span>2.<span>б)3х²-6х деленное на 2(тип дробь)=4-2х</span></span>
<span><span>3х²-6x=4-2x</span></span>
<span><span>3х²-4x+4=0</span></span>
<span><span>D=16+46=64</span></span>
<span><span>x1=2</span></span>
<span><span>x2=-2/3</span></span>
2 sin П/8 cos П/8=sin(2*П/8)=sin(П/4)=корень из 2/2
sin П/8cos П/8+1/4=1/2*sin(2*пи/8) + 1/4 = 1/2*sin(пи/4) + 1/4 = 1/2*√2/2 +1/4 = √2/4+1/4 = (√2+1)/4
110=19q+15
19q=95
q=95÷19
q=5
(a-b)(a+b)(2a+b)-ab(a+b)=(a+b)((a-b)(2a+b)-ab)=(a+b)(2a^2+ab-2ab-b^2-ab)=(a+b)(2a^2-2ab-b^2)=2a^3-2a^2b-ab^2+2a^2b-2ab^2-b^3=2a^3-3ab^2-b^3