1,2 * 5/12 : ( 3 11/30 + 7 2/15)=1/21
1) 3 11/30 + 7 2/15=3 11/30 + 7 4/30= 10 15/30= 10 1/2
2) 1,2*5/12= 1 1/5*5/12= 6/5*5/12=6/12=1/2
3) 1/2: 10 1/2= 1/2: 21/2=1/2* 2/21=1/21
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1,2 * 5/12 : ( 3 11/30 + 7 2/15)=1/21
1) 3 11/30 + 7 2/15=3 11/30 + 7 4/30= 10 15/30= 10 1/2
2) 1,2*5/12= 1 1/5*5/12= 6/5*5/12=6/12=1/2
3) 1/2: 10 1/2= 1/2: 21/2=1/2* 2/21=1/21