Oblicz ;
a)2 1/3 + 5/6 · 3/5 =
b)7 - 4/5 : 2 1/2 =
c)1 1/4 · 1 3/5 - ( 0,6 - 0,55) =
4 1/2 · 2/3 - 1/4
d)--------------------- =
4,5 · 2 + 0,4 · 5
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a)2 1/3 + 5/6 · 3/5 =2 1/3+15/30=2 10/30+15/30=2 25/30=2 5/6
b)7 - 4/5 : 2 1/2 =7-4/5*2/5=7-8/25=6 17/25
c)1 1/4 · 1 3/5 - ( 0,6 - 0,55) =5/4*8/5- 0,05=40/20-0,05=2-0,05=1,95
9/8*2/3-1/4 18/24-6/24 12/24 1/2
---------------= ------------= -------- = -----=1/2*1/11=1/22
9+2 11 11 11