7-4/5:2 1/2=6 1/5 :2 1/2=31/5:5/2=31/5*2/5=62/10=6,2
4 1/2*2/3- 1/4 =9/2*2/3- 1/4 =3-1/4 : 11=3- 1/4 *1/11=3-1/44=2 43/44
4,5*2+0,4*5 9+2
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7-4/5:2 1/2=6 1/5 :2 1/2=31/5:5/2=31/5*2/5=62/10=6,2
4 1/2*2/3- 1/4 =9/2*2/3- 1/4 =3-1/4 : 11=3- 1/4 *1/11=3-1/44=2 43/44
4,5*2+0,4*5 9+2