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Sagot :

f(x)=2x^2-5x+6 ;DF=R

f(x)=2+(1÷2x+4);DF=R-{-1÷2}

f(x)=(2÷x+1)-(3÷x-5);DF=R-{-1;5}

f(x)=5÷(x+1)(x-3);DF=R-{-1;3}

f(x)=(7x-1)÷(4x^2-36);DF=R-{-3;3}

f(x)=√(x-2);DF=[2;+infinie[

f(x)=√(15-3x);DF=]-infinie;5]

f(x)=√(x^2+1);DF=R

f(x)=2-√(4x-5);DF=[5÷2;+infinie[

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