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Katerinka64rus
@Katerinka64rus
August 2022
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Номер 213 ( 1-4) и номер 214
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turduevakzhol
Составляем и решаем уравнение:
8/(18-х)+8/(18+х)=9/10
(80(18-х)+80(18+х)-9(324-х²)/ 10(18-х)(18+х)=0
1440-80х+1440+80х-9(324-х²)=0
2880-2916+9х²=0 ,9х²=36 ,х²=36:9=4, х=2
Ответ:2 км/ч.
извини только 2 ое
1 votes
Thanks 1
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Answers & Comments
8/(18-х)+8/(18+х)=9/10
(80(18-х)+80(18+х)-9(324-х²)/ 10(18-х)(18+х)=0
1440-80х+1440+80х-9(324-х²)=0
2880-2916+9х²=0 ,9х²=36 ,х²=36:9=4, х=2
Ответ:2 км/ч.
извини только 2 ое