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b) 1/2 - ( 1/2 * 5/12 - a) : 1/8 = 1,3
1/2-( 5/24 -a ) :1/8= 1,3
1/2-5/24+a:1/8=1/3 / podzielić na 8
1/2-5/24+a +1 = 1/24
12/24- 5/24 +a +1=1/24
a= 1/24- 7/24- 1
a= -6/24-1= - 1i 1/4
c) 1 4/5 : [(1,7) + 3,6 * a] = -3,6
14/5 : 1,7 +3,6a= -3,6
14/5 * 10 / 7+3,6a= -3,6
4+ 3,6a=-3,6
3,6a= -3,6 - 4
3,6a= -7,6/ : 3,6
a= - 2 1/11