a = 3/4 and x = 3**-40

Strauss

x= 0.8225263339969959081282058400607250283965E-19 (a+x) - a= 0.8225263339969958611685571972304851389214E-19 4*(a+x) - 3*x - 3= 0.8225263339969939352386128099946320829435E-19 0.2*(a+x) + 0.8*x - 0.15= 0.8225263339969961019098002456349667709187E-19 x/(a+x)= 0.1096701778662661210717332307615448941248E-18 1 - a/(a+x)= 0.1096701778662661469213066994179955694558E-18 1/(a/x+1)= 0.1096701778662661210717332307615448941248E-18 (1-(a+0.1*x)/(a+x))/0.9= 0.1096701778662661362216958972666852630998E-18 a/(a+x)= 0.9999999999999999998903298221337338530787 1 - x/(a+x)= 0.9999999999999999998903298221337338530787 1/(1+x/a)= 0.9999999999999999998903298221337338530787 (a+x/10)/(a+x) - 0.1*x/(a+x)= 0.9999999999999999998903298221337338530787 log((a+x)/a))= 0.1096701778662660506187957060995936986397E-18 log(a+x)-log(a)= 0.1096701778662661469213066994179955694558E-18 log(1+x/a)= 0.1096701778662660506187957060995936986397E-18 -log(1-x/(a+x))= 0.1096701778662661469273204733746047874730E-18

Gershwin

x= 0.8225263339969959081282058400607210000000E-19 (a+x) - a= 0.8225263339970170463979454568248688000000E-19 4*(a+x) - 3*x - 3= 0.8225263339971403059143862399194643000000E-19 0.2*(a+x) + 0.8*x - 0.15= 0.8225263339969708240792801631643954000000E-19 x/(a+x)= 0.1096701778662661210717332307615442000000E-18 1 - a/(a+x)= 0.1096701778662689395197260609099825000000E-18 1/(a/x+1)= 0.1096701778662661210717332307615456000000E-18 (1-(a+0.1*x)/(a+x))/0.9= 0.1096701778662703090699087362777004000000E-18 a/(a+x)= 0.999999999999999999890329822133731100000 1 - x/(a+x)= 0.999999999999999999890329822133731100000 1/(1+x/a)= 0.999999999999999999890329822133731100000 (a+x/10)/(a+x) - 0.1*x/(a+x)= 0.999999999999999999890329822133731100000 log((a+x)/a))= 0.1096701778662689395137122869533728000000E-18 log(a+x)-log(a)= 0.1096701778662689395197260609099825000000E-18 log(1+x/a)= 0.1096701778662689395137122869533728000000E-18 -log(1-x/(a+x))= 0.1096701778662689395257398348665922000000E-18