1/6/1/4х - 1/3 - 3/8 = 1/40

2) 1/4/3/4х - 1/2 + 2/5 = 1/2

Ответ:

1.

1/6:(1/4х-1/3)-3/8=1/40

1/6:(1/4х-1/3)=1/40+3/8

1/6:(1/4х-1/3)=1/40+15/40

1/6:(1/4х-1/3)=2/5

1/4х-1/3=1/6:2/5

1/4х-1/3=5/12

1/4х=5/12+1/3

1/4х=5/12+4/12

1/4х=9/12

х=9/12:1/4

х=3

2.

14 : 34x -12 + 25 =12

14 : 34X = 12 +12 -25

12 + 12 -25 =510 + 510 -410 = 610 =35

14 : 34x =35

34x = 14 :35 

14  :35 = 14 x 53 =512

34x= 512

x = 512 : 34 = 512 x43 =59

x = 59

Пошаговое объяснение: