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grominartem
@grominartem
August 2022
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Решите пж: x^2-(14-x)^2=84
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niki2739
Х²-(14-х)²=84
х²-(196-28х+х²)=84
х²-196+28х-х²=84
-196+28х=84
28х=84+196
28х=280
х=10
2 votes
Thanks 1
grominartem
Спасибо, только не понял откуда 28x.
niki2739
формула сокращенного умножения там
niki2739
то есть
niki2739
(а-в)²=а²-2ав+в²
niki2739
(14-х)²=196-2×14×х+х²=196-28х+х²
grominartem
спасибо
SiriusBlack87
X^2-(196-28x+x^2)=84
x^2-196+28x-x^2=84
28x=84+196
28x=280
x=10
Ответ:10
1 votes
Thanks 1
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Answers & Comments
х²-(196-28х+х²)=84
х²-196+28х-х²=84
-196+28х=84
28х=84+196
28х=280
х=10
x^2-196+28x-x^2=84
28x=84+196
28x=280
x=10
Ответ:10