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0,8= 10-5.2/3k
2.4k=4.8
k=4,8/2,4
k=2
b)
2= 5/(a+1.5)
2(a+1.5)=5
2a+3=5
2a=2
a=1
c)
3/4= (4/9)/(1-q)
(3/4)*(1-q)= (4/9)
3/4-3/4q=4/9
3/4 - 4/9 = 3/4q
11/36= 3/4q
q=11/27