1. 10351×( 12617:31+208×43)=96792201
1) 12617:31=407
2)208×42=8944
3)407+8944=9351
4)10351×9351=96792201
2. 31/8=3,7/8
43/10=4,3/10
78/17=4,10/17
917/11=83,4/11
3. 7,1/8=57/8
3,4/5=19/5
1,7/10=17/10
9,14/15=149/15
4. 4-5/9=3,9/9-5/9=3,4/9
8-7/12=7,12/12-7/12=7,5/12
5-3,3/8=4,8/8-3,3/8=1,5/8.
Удачи!