A)(a+b)/4b-(a-b)/4b=(a+b-a+b)/4b=2b/4b=1/2
б)(3c-1)/c²+(15c-6)/c²=(3c-1+15c-6)/c²=(18c-7)/c²
в) (2x+y)/4x+(x-2y)/8x=(2*(2x+y)+x-2y)/8x=(4x+2y+x-2y)/8x=5x/8x=5/8
= х(3-у)-у(3-у)=(3-у)(х-у)
A) -3x(2-x)+(3x+1)×(x-2)
-6x+3x²+3x²-6x+x-2
-11x+6x²-2
6x²-11x-2
б)(2x-1)²+12x
4x²-4x+1+12x
4x²+8x+1
в)(x+3)²-(x-2)×(x+2)
x²+6x+9-(x-2)(x+2)
x²+6x+9-x²-2x+2x+4
8x+13-2x
6x+13
=15x^2-14x-8-12x^2+36x-27=3x^2+22x-35