Ответы на вопрос:
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 : (3/4х-1/2) + 2/5
1/4 : (3/4х - 1/2) = 1/2 + 2/5;
1/4 : (3/4х - 1/2) = 5/10 + 4/10;
1/4 : ( 3/4х - 1/2) = 9/10;
3/4х - 1/2 = 1/4 : 9/10;
3/4х - 1/2 = 1/4 * 10/9;
3/4х - 1/2 = 1/2 * 5/9;
3/4х - 1/2 = 5/18;
3/4х = 5/18 + 1/2;
3/4х = 5/18 + 9/18;
3/4х = 14/18;
3/4х = 7/9;
х = 7/9 : 3/4;
х = 7/9 * 4/3;
х = 28/27;
х = 1 1/27.
ответ:1 1/27.
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