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b)2,8 + 3 1/4 * 2,4 - 3 1/5 =2,8+13/4*2,4-3 1/5=2,8+3,25*2,4-3 1/5=2,8+7,8-3 1/5=
=10,6-3 1/5=10,6-16/5=10,6-3,2=7,4
c) (3/5) do potęgi * (2 do potęgi trzeciej - 7 2/3 + 1 3/4) =
(3/5)do potęgi 2???
(3/5)²*(2³-7 2/3+1 3/4)=0,6²*(2³-7 2/3+1 3/4)=0,36*(2³-7 2/3+1 3/4)=
=0,36*(8-7 2/3+1 3/4)=0,36*(8-23/3-1 3/4)=0,36*(1/3+1 3/4)=
=0,36*(1/3+7/4)=0,36*(1/3+1,75)=0,36*25/12=0,75
b)2,8+3 1/4 *2,4- 3 1/5=2 8/10 + 7 4/5-3 1/5=2 4/5 + 7 4/5 - 3 1/5= 7 2/5