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a fost răspuns

Efectuati   a) 2intreg si 4 supra 5 inmultit(2intreg 7 supra 10 inmultit20 supra 63 - 14 supra 15 :1 intreg si 3 supra 25)  
                 b) [(7supra15+1supra3-1supra5)inmultit cu 5supra4+(1supra2-1supra4):5supra12]inmultit cu 2supra7

Răspuns :

14/5x(27/10x20/60-14/15:28/25)=
14/5x(9/5x1/20-14/15x25/28)=
14/5x(8/100-5/6)=
14/5x(8x3/300-5x50/300)=
14/5x(24/300-250/300)=
14/5x(-226/300)=-3164/1500=-1582/750=-791/375=-2,26

b) [(7/15+1/3-1/5)x5/4+(1/2-1/4):5/12]x2/7=
[(7+5-3)/15x5/4+(2-1)/4x12/5]x2/7=
[9/3x1/4+3/5]x2/7=
[3/4+3/5]x2/7=
(15+12)/20x2/7=
27/10x1/7=27/70=

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