5✔2+23✔27-✔98=5*1.414+23*5.196-9.899=7.07+119.508-9.899=126.578-9.899=116.679
1) 0,5×3=1
2) 1+2⅓=1+⅔=1⅔(одна целая, две третьих)
Sinα(-π/3)+cosα(-π/6)=-sin(pi/3)+cos(pi/6)=-sin(pi/3)+cos(pi/2-pi/3)=<span><span>-sin(pi/3)+sin(pi/3)=0
</span>4sin π/6*sin π/4*tg π/3</span>=4*1/2*корень(2)/2*корень(3)=корень(6)
4sin^2 π/6*sin^2 π/4*tg^2 π/3 = 4*(1/2)^2*(корень(2)/2)^2*(корень(3))^2=<span>
1,5
</span>
sin^2(-π/3)+cos^2(-π/6)=sin^2(π/3)+cos^2(π/6)=(корень(3)/2)^2+(корень(3)/2)^2=6/4=1,5
2d ^18+2x^18-2d^18+2x^18-d^2 x^2=4x^18-d^2x^2=x^2(4x^16-d^2) =x^2(2x^8-d)(2x^8+d)