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Doar b)............ ......

Doar B class=

Răspuns :

E(x)=[1/(x-6)+(x+1)/(x²-36)]: (2x+7)/(3x+18)=
=[1/(x-6)+(x+1)/(x-6)(x+6)] × 3(x+6)/(2x+7)=
=(x+6+x+1)/(x-6)(x+6) × 3(x+6)/(2x+7)=
=(2x+7)/(x-6) × 3/(2x+7)=
=3/(x-6)