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a fost răspuns

Va rog. Urgent Fracti : a) 3/5+2/3-5/6 = b) 1/7-2/3+12/14 = , c) 2/3×9/8 = , d) 7/30×15/7 = , e) 2/3÷9/8 = .

Răspuns :

Spidie
a) 3/5+2/3-5/6 = (18+20-25) /30=13/30

b) 1/7-2/3+12/14 = (6-28+36) /42= 14/42=1/3

c) 2/3×9/8 = 3/4

d) 7/30×15/7 = 1/2

e) 2/3÷9/8 =2/3×8/9 =16/27

Bebedumi70
a) 3/5+2/3-5/6=>(3/5+2/3)-5/6 =>3*3+2*5/15=19/15=>19/15-5/6=19*2-(5*5)/30=13/30=>13/30=0,43333
b) 1/7-2/3+12/14=(1/7-2/3)+6/7=>3-(2*7)/21=-11/21=> -11/21+6/7=> -11+6*3/21=1/3=>1/3=0,33333
c)  2/3*9/8=3/4=0,75000
d)  7/30*15/7=1/2=0,50000
e)  2/3:9/8= 2/3:9:8=2/27:8=1/108=0,00926

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