1) 1/3Х + 6 = 2Х; 5/3Х = 6; Х = 6 : 5/3; Х = 18/5; Х = 3 3/5...
2) 1/2( 4Х - 2) = -7; 2Х - 1 = -7; 2Х = -7 + 1; 2Х = -6; Х = -6 : 2; Х = -3....
3) 5/6Х + 3 = 1/6Х; 5/6Х - 1/6Х = -3; 4/6Х = -3; 2/3Х = -3; Х = -3 : 2/3; Х = - 9/2; Х = - 4 1/2.
X:64=2000-1999;
x:64=1;
x=64*1;
x=64.
ответ: 64
160÷4=40 - 1\5
40•5=200 - 5\5
4-3
4-2
4-1
4
4+1
4+2
4+3
4+4
4+5
4+6
К.11.
1.а:b=7:21=3
2.x:y=18:12=1.5
3.1ч:15мин=1ч2мин
4.2є:1.50є=1.333...є
5.15:8=1.875
6.90:120=0.75
К.12.360:3=120м