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solve for a.s=a+b+c/2

Sagot :

The solution is

[tex]\begin{gathered} s=\frac{a+b+c}{2} \\ 2s=a+b+c\text{ (cross multiplying)} \\ 2s-b-c=a\text{ } \\ a=2s-b-c \end{gathered}[/tex]

a=2s-b