a) \(=\dfrac{1}{2}.\left|a\right|=-\dfrac{1}{2}a\)
b) \(=\left|5a\right|+5a=5a+5a=10a\)
c) \(=\left|9b^3\right|-2b^3=-9b^3-2b^3=-11b^3\)
d) \(=\dfrac{1}{2}\sqrt{4\left(a-b\right)^2}=\dfrac{1}{2}\left|2\left(a-b\right)\right|=\dfrac{1}{2}.2.\left(a-b\right)=a-b\)
e) \(=\left|b\left(b-1\right)\right|=\left(-b\right).\left(-b+1\right)=b^2-b\)
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