Jawabanmu

2014-02-02T21:14:51+07:00
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2014-02-02T23:11:50+07:00
A : b = 2:5
        =(2x4,8) : (5x4,8)
        =  9,6:24
a =9,6  b=24

5a-b = 24
5*9,6 - 24 =24
48-24 =24

c=  1/7(a+b)=1/7(12)=12/7
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