1) (7/12)-((1/6)-x)=(1/2)|×12
12×(7/12)-12×((1/6)-x)=12×(1/2)
7-2+12x=6
12x=6-7+2
12x=-1+2
12x=1|÷12
x=(1/12)
Проверка:
(7/12)-((1/6)-(1/12)=(1/2)
(7/12)-((1×2-1)/12)=(1/2)
(7/12)-(1/12)=(1/2)
(7-1)/12=(1/2)
(6/12)=(1/2)
(1/2)=(1/2)- истина.
2) ((5/8)+х)-(1/15)=(1/2)|×120
120×((5/8)+х)-120×(1/15)=120×(1/2)
15×5+120х-8=60
75+120х-8=60
120х=60-75+8
120х=-7|÷120
х=(-7/120)
Проверка:
((5/8)+(-7/120)-(1/15)=(1/2)
(5×15-7)/120-(1/15)=(1/2)
(75-7)/120-(1/15)=(1/2)
(68/120)-(1/15)=(1/2)
(68-1×8)/120=(1/2)
(60/120)=(1/2)
(1/2)=(1/2)-истина.