Пошаговое объяснение:
(3/5х+4/9х)•45=94
27/45x+20/45x=94/45
47/45x=94/45
x=94/45*45/47
x=2
(2/7х+3/8х)•56=74
16/56x+21/56x=74/56
37/56x=74/56
x=74/56*56/37
x=2
(2 2/3х+1 3/7х)•21=58
2 14/21x+1 9/21x=58/21
3 23/21x=58/21
x=58/21:3 23/21
x=58/21*21/86
x=58/86=29/43
33•(3 1/3х-1 1/11х)=19
3 11/33x-1 3/33x=19/33
2 8/33x=19/33
x=19/33:2 8/33
x=19/33*33/74
x=19/74
