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

Răspuns :

[(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