б.

(x²-4y²):x+2y/2y

(x-2y)*(x+2y)*2y/x+2y

(x-2y)*2y

2xy-4y²

в.

8m-2n/2n+3*8+6n/32m²-2n²

(2m-2n)*(8+6n)/(2n+3)*(32²-2n²)

16m+12mn-16n-12n²/(2n+3)*2(16m²-n²)

2(8m+6mn-8n-6n²)/(2n+3)*2(16m²-n²)

8m+6mn-8n-6n²/(2n+3)*(16m²-n²)

8m+6mn-8n-6n²/32m²n-2n³+48m²-3n²

г.

y+6/y²-12y+36:6y+36/y³-6y²

y²/6y-36