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.
1\4 : 3\4x -1\2 + 2\5 =1\2
1\4 : 3\4X = 1\2 +1\2 -2\5
1\2 + 1\2 -2\5 =5\10 + 5\10 -4\10 = 6\10 =3\5
1\4 : 3\4x =3\5
3\4x = 1\4 :3\5
1\4 :3\5 = 1\4 x 5\3 =5\12
3\4x= 5\12
x = 5\12 : 3\4 = 5\12 x4\3 =5\9
x = 5\9
Пошаговое объяснение: