(2х-3у)² + (2х+3у)²= 4х²-12ху+9у²+4х²+12ху+9у²=8х²+18у².
6*0.12/3.6=0.2 Отвееет:0.2
1) 4x^4*( - 2x^2)^3 = 4x^4 * ( - 8x^6) = - 32x^10
2) 9x^2 - 1 + 9x^2 + 6x + 1 = 18x^2 + 6x
Sin²x+3cosxsinx+1=0
2sin²x+3cosxsinx+cos²x=0 /cos²x≠0
2tg²x+3tgx+1=0
tgx=a
2a²+3a+1=0
D=9-8=1
a1=(-3-1)/4=-1⇒tgx=-1⇒x=-π/4+πn
a2=(-3+1)/4=-1/2⇒tgx=-1/2⇒x=-arctg0,5+πn