20 1/4 : ( 1 1/2 - 2 1/2 * 1 1/4)=
20 1/4 : ( 1 1/2 - 2 1/2 x 1/4) = 20,25 : ( 1,5 - 2,5 x 0,25)= 20,25: (1,5 -0,625)=
= 20,25 : 0,875= 2,314
20 1/4:(1 1/2-2 1/2*1 1/4)=81/4:(3/2-5/2*5/4)=81/4:(3/2-25/8)=81/4:(12/8-25/8)=81/4:(-13/8)=81/4*(-8/13)=-648/52=-12 6/13
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20 1/4 : ( 1 1/2 - 2 1/2 x 1/4) = 20,25 : ( 1,5 - 2,5 x 0,25)= 20,25: (1,5 -0,625)=
= 20,25 : 0,875= 2,314
20 1/4:(1 1/2-2 1/2*1 1/4)=81/4:(3/2-5/2*5/4)=81/4:(3/2-25/8)=81/4:(12/8-25/8)=81/4:(-13/8)=81/4*(-8/13)=-648/52=-12 6/13