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a-1/2a * (a+3/a+1 – a2-5/a2-1)= a-1/2a * (a+3/a+1 – a2-5/(a+1)(a-1))=a-1/2a * (a2+2a-3/a2-1 – a2-5/a2-1)=
a-1/2a * 2a+2/(a+1)(a-1)= a-1/2a * 2(a+1)/(a+1)(a-1)=1/a
4y/y-1 * ( y/8-1/4+1/8y)= 4y/y-1 * (y-1)2/8y=4y2-4y/8y=y2-y/2y

a3-b3/a-b * a/a2ab+b2- (a-b)=(a2ab+b2)(a-b)/ a-b * a/a2+ab+b2-(a-b)= a-b/a-b*a/1-(a-b) = a-a+b= b

x+4/x
x=-4
2x+5/3-x
x=-5

0/2=0
-2/2=-1
2³/2=22

2-3*0/7*0= 0
2+6/-14=0.57

2-3(23)/7(23)= 1/3(23)=0.125