Номер 121
(7/12-8/15)^2+4/5*(7/10-9/16)=
=0,1125
1) (7/12-8/15)^2=(7/12(*5)-8/15(*4)=
= (35/60-32/60)^2=(3/60)^2=
= (1/20)^2=(0,05)^2=0,0025
2) 7/10-9/16=7/10(8)-9/16(5)=
=56/80-45/80=11/80
3) 4/5*11/80=11/100=0,11
4) 0,0025+0,11=0,1125
Ответ: 0,1125