Zadanie
Wykonaj działania:
(x+y)/(x+1)-(x-y)/(x+1)
(a+4)/(a-1)+(a-3)/(1-a)
(x+y)/(x+1)-(x-y)/(x+1)= y-(-y)=y+y=2y
(a+4)/(a-1)+(a-3)/(1-a)= -4a+(-3a)= -4a-3a=-7a
(x+y)/(x+y)-(x-y)/(x+y)= (x+y)/(x+y)-x+y/(x+y) / mnozymy obustronnie razy (x+y) i zostaje x+y-x+y=2y
(a+4)/(a-1) +(a-3)/(1-a)/ mnozymy obustronnie razy (a-1) i zostaje
a+4+a-3=2a-1
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(x+y)/(x+1)-(x-y)/(x+1)= y-(-y)=y+y=2y
(a+4)/(a-1)+(a-3)/(1-a)= -4a+(-3a)= -4a-3a=-7a
(x+y)/(x+y)-(x-y)/(x+y)= (x+y)/(x+y)-x+y/(x+y) / mnozymy obustronnie razy (x+y) i zostaje x+y-x+y=2y
(a+4)/(a-1) +(a-3)/(1-a)/ mnozymy obustronnie razy (a-1) i zostaje
a+4+a-3=2a-1