Помогите решить неравенство 2x²+7x-4→0 упростить выражение √18(√6-√2)-3√12 реш...

July 2022 1 0 Report

Помогите решить
неравенство 2x²+7x-4→0
упростить выражение √18(√6-√2)-3√12
решите систему (y-5x=1
(y²-13x=23.

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$1) \\ 2x^2+7x-4\ \textgreater \ 0 \\ 2x^2+7x-4=0 \\ D=49+32=81=9^2 \\ x_1= \dfrac{-7-9}{4}=-4 \\ x_2= \dfrac{-7+9}{4}=0,5$

____+____(-4)_____-____(0,5)___+_____

Ответ: x∈(-∞;-4)U(0,5;+∞)

$2) \\ \sqrt{18}( \sqrt{6}- \sqrt{2})-3 \sqrt{12}= \\ =3 \sqrt{2}( \sqrt{6}- \sqrt{2})-6 \sqrt{3}= \\= 3 \sqrt{12}-6-6 \sqrt{3}= \\ =6 \sqrt{3}-6-6\sqrt{3}= \\ =-6 \\ \\ 3) \\y-5x=1 \\ y^2-13x=23 \\ \\ y=5x+1 \\ (5x+1)^2-13x=23 \\ \\ 25x^2+10x+1-13x-23=0 \\ 25x^2-3x-22=0 \\ D=9+2200=2209=47^2 \\ x_1= \dfrac{3+47}{50}=1 \\ x_2= \dfrac{3-47}{50}=- \dfrac{22}{25} \\ \\ y_1=5+1=6 \\ y_2=5*(- \dfrac{22}{25})+1=- \dfrac{17}{5}$

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esse na temu recept schastya dlya rossii

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andreyklimanov July 2022 | 0 Ответы

pomogite reshitneravenstvo 2x7x 40uprostit vyrazhenie186 2 312reshite

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Verified answer

esse na temu recept schastya dlya rossii

pomogite reshitneravenstvo 2x7x 40uprostit vyrazhenie186 2 312reshite

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