Question

a)x+4y asupra 12 + 2x+5y asupra 12
b)a+2b asupra 2c - a-4 asupra 2c
c)a-8 asupra a la 2- 25 +13 asupra a la 2 - 25
urgent!!!

Answer 1

A)(x+4y)/12 + (2x+5y)/12=
=(x+4y+2x+5y)/12=
=(3x+9y)/12=
=3(x+3y)/12=
=(x+3y)/4=

b) (a+2b)/2c -( a-4)/2c=
=(a+2b - a+4)/2c=
=(2b+4)/2c=
=2(b+2)/2c=
=(b+2)/c

 c)(a-8) /(a²- 25) +13/(a² - 25)=
=(a-8 +13)/(a -5)(a+5)=
=(a+5)/(a -5)(a+5)=
=1/(a -5)