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ВеликийСвятойМагистр
@ВеликийСвятойМагистр
August 2022
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Решить уравнения пожалуйста! (х-1)(х-7)=0
(4у-11)/15 + (13-7у)/20=2
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lenapanova
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гюйс
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(х-1)(х-7)=0
х²-7х-х+7=0
х²-8х+7=0
D/4= 4²-7=9, √D/4=+-3
х₁=(4+3)/7=1
х₂=(4-3)/7=3/7
(4у-11)/15 + (13-7у)/20=2
4(4у-11)+3(13-7у)=2*60
16у-44+39-21у=120
-5у=120+5
-5у=125
у= -125:5
у= -25
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Answers & Comments
Verified answer
...................................Verified answer
(х-1)(х-7)=0х²-7х-х+7=0
х²-8х+7=0
D/4= 4²-7=9, √D/4=+-3
х₁=(4+3)/7=1
х₂=(4-3)/7=3/7
(4у-11)/15 + (13-7у)/20=2
4(4у-11)+3(13-7у)=2*60
16у-44+39-21у=120
-5у=120+5
-5у=125
у= -125:5
у= -25