14•(1/2+1/3+1/4) = 14 * (6/12 + 4/12 + 3/12) = 14 * 13/12 = 182/12 = 15 2/12
1/3•6/7-1/7•3/4 = 1/1 * 2/7 - 3/28 = 2/7 - 3/28 = 8/28 - 3/28 = 5/28
1 3/11-27/44•4/9 = 14/11 - 3/11 * 1/1 = 14/11 - 3/11 = 11/11 = 1
<span>1 2/3+14/15•5/7 = 5/3 + 2/3 * 1/1 = 5/3 + 2/3 = 7/3 = 2 1/2</span>
40
*17
-------
280
+ 40
-------
680
5383×96÷(20+19+9)+10399+(47063-184)×7=349297<span>
1) 20+19+9=48
2)47063-184=46876
3)5383*96=516768
4)516768:48=10766
5)</span>46876*7=328132
6)10766+10399=21165
7)21165+328132=349297
4 1/5: 7/15: 1/5=21/5 × 15/7: 1/5=9 ×5=45
3*3*5*7=3²*5*7=315
3*5*5*7=3*5²*7=525
3*5*7*7=3*5*7²=735