Question

Срочно математика пожалуйста

Answer 1

1) (6x-x)/5y= 5x/5y= x/y

2) (2m-4n+5m+18n)/21c= (7m+14n)/21c=(m+2n)/3c

3) (2a+5b-2a+3b)/ab=8b/ab= 8/a

4) (5y-15)/y^2-9= 5(y-3)/(y-3)(y+3)= 5/(y+3)

5) (y^2+8y-4y+4)/4-y^2= (y^2+4y+4)/4-y^2= (y+2)^2/(2-y)(2+y)= (y+2)/(2-y)

6) (16-7x-x+x^2)/(x-4)^2= (x^2-8x+16)/(x-4)^2= (x-4)^2/(x-4)^4= 1