№342
15 4/9-4 4/9*3 3/8=15 4/9-15=4/9
1)4 4/9*3 3/8=40/9*27/8=5/1*3/1=15/1=15
2)15 4/9-15=4/9
81/88*(6-1 13/15*1 19/21)=81/88*2 4/9=9/4
1)1 13/15*1 19/21=4/3*8/3=32/9=3 5/9
2)6-3 5/9=5 9/9-3 5/9=2 4/9
3)81/88* 2 4/9=81/88*22/9=9/4*1/1=9/4
(5 1/16-1 1/8)*(5/6+3/14)=2 15/16*22/21=3 13/168
1)5 1/16(*1)- 1 1/8(*2)=5 1/16 - 1 2/16=4 17/16-1 2/16=2 15/16
2)5/6(*7)+3/14(*3)=35/42+9/42=44/42=22/21
3)2 15/16*22/21=47/16*22/21=1034/336=3 26/336=3 13/168
5 1/16-1 1/8*(5/6+3/14)=5 1/16-1 1/8*44/42=5 1/16-3 15/28=2 17/42
1)5/6(*7)+3/14(*3)=35/42+9/42=44/42
2)1 1/8*44/42=9/8*44/42=9/2*11/14=99/28=3 15/28
3)5 1/16(*7)-3 15/28(*4)=5 7/42-3 60/42=5 7/42-2 18/42=4 35/42-2 18/42=
=2 17/42