(1/a^2+2ab-1/a^2-2ab):4b^2/4b^2-a^2 при a=-1, b=1

Question

(1/a^2+2ab-1/a^2-2ab):4b^2/4b^2-a^2 при a=-1, b=1

Answer 1

(1/a^2+2ab-1/a^2-2ab):4b^2/4b^2-a^2=(1-2-1+2):4-1=-1

Comments

неправильно там нулю равно

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(1+(-2-1)/(1+2))/4/3