во втором можно 3/6 сократить и получаем:
1)
(84*8*4)/(14*2*24*11)=4/11
2)
3//22=6/44
4//11=16/44
1//2=22//44
3)
x+3//4=1//2+3//5
x+0.25-0.6=0
x-0.35=0
x=0.35
4)
(0,6-3//14)-(2/7-0,4)=27//70-(2//7-0.4)=27//70+4//35=0.5
