(3/5х+4/9х)•45=94 (2/7х+3/8х)•56=74 (2 2/3х+1 3/7х)•21=58 33•(3 1/3х1 1/11х)=19

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