(x²-2x)²-7x²+14x-8=0 решите уравнение. Created by nyafa. algebra-ru

(x²-2x)²-7x²+14x-8=0 решите уравнение...

nyafa @nyafa

July 2022 1 3 Report

(x²-2x)²-7x²+14x-8=0 решите уравнение

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Незнaйкa

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(Х^2-2х)^2-7(х^2-2х)-8=0
х^2-2х=t
t^2-7t-8=0
D=49+32=81
t=(7+9):2=8
t2=(7-9):2=-1
X^2-2x=8
X^2-2x-8=0
D=4+32=36
X1=(2+6):2=4
X2=(2-6):2=-2
X^2-2x=-1
X^2-2x+1=0
(X-1)^2=0
X3=1
Ответ:4;-2;1

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sostavte 15 voprosov k etomu tekstu ohenry was a famous american humorist

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