1) 2y(6x +¹/₄y)² - x(8x+3y)² =
=2y(36x² +3xy+¹/₁₆ y²) - x(64x²+48xy+9y²)=
=72x²y+6xy² +¹/₈ y³ - 64x³ -48x²y -9xy²=
=¹/₈ y³ - 3xy² +24x²y -64x³ =
=(¹/₂ y)³ - 3*(¹/₂ y)² *4x + 3* ¹/₂ y *(4x)² - (4x)³ =
<span>=(¹/₂ y -4x)³</span>
7x^2-21=0
x^2-3=0
(x-3)(x+3)=0
x= +3;-3
2(a-b)/3(b-a)=-2/34mn(m-n)/2m(n-m)=-2n<span>6a^2b^3(3-a)/14ab^3(a-3)=-3a/7</span>
A)D=169-4*3*(-10)=289
x1=(-13-17):6=-5 x2=(-13+17):6=1/3
v)x=7/4
g)D=4-4*(-35)=144
x1=(2-12):2=-5 x2=(2+12):2=7