Ответ:
Пошаговое объяснение:
1) (3-3/7) : (1/14+1/4)=(2 7/7-3/7) : (2/28+7/28)=2 4/7 : 9/28= 18/7 * 28/9=8;
2) (2/9+2/15)/(1/9-2/3)=(10/45+6/45)/(1/9-6/9)=16/45 : (-5/9)= -16/45*9/5=-16/25;
3) (7/12-8/15)^2+4/5(7/10-9/16)=(35/60-32/60)^2+4/5 (56/80-45/80)=
=(1/20)^2+4/5 * 11/80=1/400+4*11/5*80==1/400 + 44/400=45/400=9/80.
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Answers & Comments
Ответ:
Пошаговое объяснение:
1) (3-3/7) : (1/14+1/4)=(2 7/7-3/7) : (2/28+7/28)=2 4/7 : 9/28= 18/7 * 28/9=8;
2) (2/9+2/15)/(1/9-2/3)=(10/45+6/45)/(1/9-6/9)=16/45 : (-5/9)= -16/45*9/5=-16/25;
3) (7/12-8/15)^2+4/5(7/10-9/16)=(35/60-32/60)^2+4/5 (56/80-45/80)=
=(1/20)^2+4/5 * 11/80=1/400+4*11/5*80==1/400 + 44/400=45/400=9/80.