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sophiabannova
@sophiabannova
August 2022
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найдите корень уравнения (x-10)(x+30)-(x-20)(x+20) =40
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irinaorlova2
(х-10)(х+30)-(х-20)(х+20)=40
х²+30х-10х-300-х²+400-40=0
20х+60=0
20х=-60
х=-60:20
х=-3
проверка
(-3-10)(-3+30)-(-3-20)(-3+20)=40
(-13)*27-(-23)*17=40
-251+396=40
40=40
6 votes
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sophiabannova
спасибо)
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Answers & Comments
х²+30х-10х-300-х²+400-40=0
20х+60=0
20х=-60
х=-60:20
х=-3
проверка
(-3-10)(-3+30)-(-3-20)(-3+20)=40
(-13)*27-(-23)*17=40
-251+396=40
40=40