Решите уравнения x^2-3x-40=0 x^2+7x+6=0 x^2-4x-5=0 10/x-4=5/2. Created by KPine. algebra-ru

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August 2022 1 32 Report

Решите уравнения
x^2-3x-40=0
x^2+7x+6=0
x^2-4x-5=0
10/x-4=5/2

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selmash21 Х^2-3х-40=0
д=9-4×1×(-40)=169
х1=(3-13)/2=-5
х2=(3+13)/2=8

х^2+7х+6=0
д=49-4×1×6=25
х1=(-7-5)/2=-6
х2=(-7+5)/2=-1

х^2-4х-5=0
д=16-4×(-5)×1=36
х1=(4-6)/2=-1
х2=(4+6)/2=5

5(х-4)=2×10
5х-20=20
5х=40
х=8

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