Question

[($\frac{1}{15}$-$\frac{1}{18}$):$\frac{1}{45}+ \frac{1}{60}$($\frac{1}{12}- \frac{1}{15}$):1$\frac{1}{2}$= ?

Answer 1

[(1/15-1/18):1/45+1/60(1/12-1/15)]:1intreg1/2=

Obs:1/15-1/18=(6-5)/90=1/90
Obs:1/12-1/15=(5-4)/60=1/60
obs:1intreg 1/2=  (1·2+1)/2=3/2

[1/90·45/1+1/60·1/60]:3/2=

obs: 1/90·45/1=45/90 simplif.cu 5=9/18=simplif.cu 9=1/2

=(1/2+1/3600)·2/3=((1800+1)/3600·2/3=1801/3600·2/3=simplif.cu 3=
600/3600·2/1=simplif.cu 2=600/1800=6/18=simplif.cu 6=1/3