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zlata25148
@zlata25148
August 2022
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7ху+у=16
7ху-х=13
...,.
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MizoriesKun
7ху+у=16
7ху-х=13
----------------- отнимем почленно
у-(-х)=у+х=3
⇒у=3-х
7х*(3-х)+3-х=16
21х-7х²+3-х-16=0
7х²-20х+13=0
D=400-364=36
x₁=(20+6)/14=13/7=1.6/7 y₁=3-1 6/7=1 1/7
x₂=(20-6)/14=1 y₂=3-1=2
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Answers & Comments
7ху-х=13
----------------- отнимем почленно
у-(-х)=у+х=3 ⇒у=3-х
7х*(3-х)+3-х=16
21х-7х²+3-х-16=0
7х²-20х+13=0
D=400-364=36
x₁=(20+6)/14=13/7=1.6/7 y₁=3-1 6/7=1 1/7
x₂=(20-6)/14=1 y₂=3-1=2