Вычислите : 1) х-2/3=1/18 2) 1/12+х=3/4 +1/6 3)19/20-х=1/4 4)х+3/20=7/10+1/4

Question

Вычислите :
1) х-2/3=1/18
2) 1/12+х=3/4 +1/6
3)19/20-х=1/4
4)х+3/20=7/10+1/4

Answer 1

Х-2/3=1/18
х=1/18+2/3        1/18+2/3=(1+12)/18=13/18
х=13/18

1/12+х=3/4+1/6
х=3/4+1/6-1/12          3/4+1/6-1/12=(9+2-1)/12=10/12=5/6
х=5/6

19/20-х=1/4
х=19/20-1/4           19/20-1/4=(19-5)/20=14/20=7/10
х=7/10

х+3/20=7/10+1/4
х=7/10+1/4-3/20          7/10+1/4-3/20=(14+5-3)/20=16/20=4/5
х=4/5

Answer 2

1) x = 2/3 + 1/18
x = 13/18
2) 1/12 + x = 3/4 + 1/6
x = 3/4 + 1/6 - 1/12
x = 10/12 = 5/6
3) 19/20 - x = 1/4
-x = 1/4 - 19/20
- x = - 14/20
x = 14/20 = 7/10
4) x + 3/20 = 7/10+1/4
x= 7/10 + 1/4 - 3/20
x = 16/20 = 4/5