Объяснение:
1) 9 8/15 - 4 1/12+3 7/20 => Находим общий знаменатель НОК(15;12;20)=60=> => 9 8*4/60-4 1*5/60+3 7*3/60 =
=9 32/60-4 5/60+3 21/60=(9-4+3) (32-5+21)/60=8 48/60=8 4/5=8.8;
2) 7 5/6 + 3 2/3 - 8 3/16 => НОК(6;3;16)=48=> 7 5*8/48+3 2*16/48-8 3*3/48=
=7 40/48 + 3 32/48 - 8 9/48=(7+3-8) (40+32-9)/48=2 63/48=3 15/48=3 5/16;
3) 20-(3 1/6+2 3/4)=> НОК(6;4)=12=>20-(3 2/12+2 9/12)=20-5 11/12=
=19 12/12 - 5 11/12=14 1/12.
Объяснение:
1) 9 8/15 - 4 1/12+3 7/20 => Находим общий знаменатель НОК(15;12;20)=60=> => 9 8*4/60-4 1*5/60+3 7*3/60 =
=9 32/60-4 5/60+3 21/60=(9-4+3) (32-5+21)/60=8 48/60=8 4/5=8.8;
2) 7 5/6 + 3 2/3 - 8 3/16 => НОК(6;3;16)=48=> 7 5*8/48+3 2*16/48-8 3*3/48=
=7 40/48 + 3 32/48 - 8 9/48=(7+3-8) (40+32-9)/48=2 63/48=3 15/48=3 5/16;
3) 20-(3 1/6+2 3/4)=> НОК(6;4)=12=>20-(3 2/12+2 9/12)=20-5 11/12=
=19 12/12 - 5 11/12=14 1/12.