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(1-5/7)×0,49=(7/7-5/7)x49/100=2/7x 49/100=1/50
45,1-1,5×2 do potęgi 2=45,1-4=41,1
4,8:1/4+1,5×2/5= 4 8/10 :1/4+1 1/2 x 2 1/2=4 8/10= 4 8/10 : 1/4=12/10=6/5+1 1/2=1 17/10 x 2/5=17/25