20 1/4 :2-( 1 1/2 + 2 1/2 * 1 1/4)=
20 1/4:-(1 1/2 + 2 1/2 * 1 1/4)=20 1/4 : 2-(1 1/2 + 25/8)=201/4:2-37/8=81/8 - 37/8=44/8=22/4=11/2=5 1/2
20 1/4:2-(1 1/2+2 1/2*1 1/4)=
81/4:2-(3/2+5/2*5/4)=
81/4*1/2-(3/2+25/8)=
81/8-(12/8-25/8)=
81/8-(-13/8)=
81/8+13/8=94/8=11 3/4
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20 1/4:-(1 1/2 + 2 1/2 * 1 1/4)=20 1/4 : 2-(1 1/2 + 25/8)=201/4:2-37/8=81/8 - 37/8=44/8=22/4=11/2=5 1/2
20 1/4:2-(1 1/2+2 1/2*1 1/4)=
81/4:2-(3/2+5/2*5/4)=
81/4*1/2-(3/2+25/8)=
81/8-(12/8-25/8)=
81/8-(-13/8)=
81/8+13/8=94/8=11 3/4