1) 6,75*10^(-4+8) / 8.1 =5*10^4/6
2)70,26+291,8132=362,0732
√48-2√3(2-5√12)=√48-4√3+10√12*3= √4*4*3-4√3+10√36= 4√3-4√3+10*6=60
(x^2 - 1)(x^2 + 3) = (x^2 + 1)^2 + x
x^4<u>+3x^2-x^2</u>-3= (x^4+2x^2+1)+x
x^4+2x^2-3= x^4+2x^2+1+x
<em>x^4+</em><u>2x^2</u>-3-x^4<u>-2x^2-</u>1-x=0
-4-x=0
-x=4
x=-4
Ответ:-4