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3,8 - (- 1 3/4 ) * ( - 4/7 )
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-(-3,5) - (- 1 3/4)
=(3,8-1): (3,5+1,75)=2,8:5,25=0,5(3)
dziesietna czesc=0,5(3)*0,1=0,05(3)