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Sagot :

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[tex]22)\ f(x)=\dfrac{2x+6}{3}\\\\f(x)=\dfrac{2}{3}x+2\\\\23)a)\ f(x)=\dfrac{x+5}{2}-x=\dfrac{x}{2}+\dfrac{5}{2}-x\\\\f(x)=-\dfrac{x}{2}+\dfrac{5}{2}\\\\b)\ f(x)=(x-1)^2-x^2=x^2-2x+1-x^2\\\\f(x)=-2x+1[/tex]

[tex]24a)\ f(x)=2(x+1)-3(x-2)=2x+2-3x+6\\\\f(x)=-x+8\\\\b)\ f(x)=(2x+1)^2-4x^2=4x^2+4x+1-4x^2\\\\f(x)=4x+1\\\\25a)\ f(x)=\dfrac{1}{2}x+\dfrac{x+5}{2}=\dfrac{1}{2}x+\dfrac{x}{2}+\dfrac{5}{2}\\\\f(x)=x+\dfrac{5}{2}\\\\b)\ f(x)=x^2+(2+x)(3-x)=x^2+6-2x+3x-x^2\\\\f(x)=x+6[/tex]

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